[SDK-753] Update sample readme

Samples/README.md

@@ -1,13 +1,131 @@
-Please follow these below steps to run samples
-
-- Navigate to the desired sample
-- In CMD, run the command, pod install
-- Open the .xcworkspace file using xcode
-- Click on Build and run
-
-`Note`:
-In every sample, in Skyflow.Config(), replace with the following fields:
-1. Replace the placeholder "<VAULT_ID>" with the correct vaultId you want to connect
-2. Replace the placeholder "<VAULT_URL>" with the correct vaultURL
-3. Implement the bearer token endpoint using server side auth SDK and service account file.
-   Replace the placeholder "<TOKEN_END_POINT_URL>" with the  bearer token endpoint which gives the bearerToken, implemented at your backend. 
+# iOS SDK samples
+Test the SDK by adding `VAULT-ID`, `VAULT-URL`, and `SERVICE-ACCOUNT` details in the required places for each sample.
+
+### Prerequisites
+- iOS 13.0.0 or higher
+- [cocoapods](https://cocoapods.org)
+- Xcode
+- [Node.js](https://nodejs.org/en/) 10 or higher
+- [npm](https://docs.npmjs.com/downloading-and-installing-node-js-and-npm) 6.x.x or higher
+
+- [express.js](http://expressjs.com/en/starter/hello-world.html)
+
+
+### Create the vault
+1.  In a browser, sign in to Skyflow Studio.
+2. Create a vault by clicking **Create Vault** > **Start With a Template** > **PIIData**.
+3. Once the vault is ready, click the gear icon and select **Edit Vault Details**.
+4. Note your **Vault URL** and **Vault ID** values, then click Cancel. You'll need these later.
+
+### Create a service account
+1. In the side navigation click, **IAM** > **Service Accounts** > **New Service Account**.
+2. For **Name**, enter "SDK Samples". For Roles, choose **Vault Editor**.
+3. Click **Create**. Your browser downloads a **credentials.json** file. Keep this file secure. You'll need it to generate bearer tokens.
+
+### Create a bearer token generation endpoint
+1. Create a new directory named `bearer-token-generator`.
+
+        mkdir bearer-token-generator
+2. Navigate to `bearer-token-generator` directory.
+
+        cd bearer-token-generator
+3. Initialize npm
+
+        npm init
+4. Install `skyflow-node`
+
+        npm i skyflow-node
+5. Create `index.js` file
+6. Open `index.js` file
+7. populate `index.js` file with below code snippet
+```javascript
+const express = require('express')
+const app = express()
+var cors = require('cors')
+const port = 3000
+const {
+    generateBearerToken,
+    isExpired
+} = require('skyflow-node');
+
+app.use(cors())
+
+let filepath = 'cred.json';
+let bearerToken = "";
+
+function getSkyflowBearerToken() {
+    return new Promise(async (resolve, reject) => {
+        try {
+            if (!isExpired(bearerToken)) resolve(bearerToken)
+            else {
+                let response = await generateBearerToken(filepath);
+                bearerToken = response.accessToken;
+                resolve(bearerToken);
+            }
+        } catch (e) {
+            reject(e);
+        }
+    });
+}
+
+app.get('/', async (req, res) => {
+  let bearerToken = await getSkyflowBearerToken();
+  res.json({"accessToken" : bearerToken});
+})
+
+app.listen(port, () => {
+  console.log(`Server is listening on port ${port}`)
+})
+```
+8. Start the server
+
+        node index.js
+    server will start at `localhost:3000`
+9. Your **<TOKEN_END_POINT_URL>** with `http://localhost:3000/`
+
+## The samples
+### Collect and reveal
+This sample illustrates how to use secure Skyflow elements to collect sensitive user information and reveal it to the user via tokens.
+#### Configure
+1. In `Skyflow.Configuration()` of [ViewController.swift](CollectAndRevealSample/CollectAndRevealSample/ViewController.swift), replace with the following fields:
+         - Replace the placeholder "<VAULT_ID>" with the correct vaultId you want to connect
+         - Replace the placeholder "<VAULT_URL>" with the correct vaultURL
+2. Update `Fields` struct in [ResponseStructs.swift](CollectAndRevealSample/CollectAndRevealSample/ResponseStructs.swift) with field name of used vault. For ex: 
+
+        ```swift
+            struct Fields: Codable {
+               let name: NameField
+               let cvv: String
+               let cardExpiration: String
+               let cardNumber: String
+               let skyflow_id: String
+            }
+        ```
+
+    The fields can be different depending upon the vault.
+3. Update 
+4. Replace the placeholder "<TOKEN_END_POINT_URL>" of [ExampleTokenProvider.swift](CollectAndRevealSample/CollectAndRevealSample/ExampleTokenProvider.swift) with the  bearer token endpoint which gives the bearerToken, implemented at your backend or `http://localhost:3000/`.
+ 5. Running the sample
+    1. Open CMD
+    2. Navigate to `CollectAndRevealSample`
+    3. Run 
+
+            pod install
+    4. Open the [`CollectAndRevealSample.xcworkspace](`CollectAndRevealSample/`CollectAndRevealSample.xcworkspace) file using xcode
+    5. click on build and run
+
+### Validations
+This sample illustrates how to apply custom validation rules on secure Skyflow Collect elements to restrict the type of input a user can provide.
+#### Configure
+1. In `Skyflow.Configuration()` of [ViewController.swift](Validations/Validations/ViewController.swift), replace with the following fields:
+2. Replace the placeholder "<VAULT_ID>" in the configuration with the correct vaultId you want to connect
+3. Replace the placeholder "<VAULT_URL>" with the correct vaultURL
+4. Replace the placeholder "<TOKEN_END_POINT_URL>" in [ExampleTokenProvider.swift](Validations/Validations/ExampleTokenProvider.swift) with the  bearer token endpoint which gives the bearerToken, implemented at your backend or `http://localhost:3000/`.
+5. Running the sample
+      1. Open CMD
+      2. Navigate to `Validations`
+      3. Run 
+
+             pod install
+      4. Open the [Validations.xcworkspace](Validations/Validations.xcworkspace) file using xcode
+      5. click on build and run