Added typings for package

Author: Slava Baginov

package.json

@@ -34,6 +34,7 @@
     "mocha": "^2.5.3",
     "nyc": "^10.2.0"
   },
+  "typings": "typings.d.ts",
   "engines": {
     "node": ">=0.10"
   }

typings.d.ts

@@ -0,0 +1,48 @@
+/// <reference types="node" />
+import * as https from "https";
+import * as stream from "stream";
+
+declare class ClickHouse {
+    constructor(options: ClickHouse.Options);
+    query(chQuery: string, options: ClickHouse.QueryOptions, cb?: ClickHouse.QueryCallback): ClickHouse.RecordStream;
+    query(chQuery: string, cb?: ClickHouse.QueryCallback): ClickHouse.RecordStream;
+    querying(chQuery: string, options?: ClickHouse.QueryOptions): Promise<ClickHouse.QueryResult>;
+    ping(cb?: ClickHouse.QueryCallback): ClickHouse.RecordStream;
+    pinging(): Promise<ClickHouse.QueryResult>;
+}
+
+declare namespace ClickHouse {
+    type SpecificConstructorOptions = {
+        user?: string;
+        password?: string;
+        useQueryString?: boolean;
+    } & QueryOptions;
+
+    type ConstructorOptions = https.RequestOptions & SpecificConstructorOptions;
+
+    export type Options = ConstructorOptions | string;
+
+    export type QueryOptions = {
+        dataObjects?: boolean;
+        format?: string;
+        syncParser?: boolean;
+        omitFormat?: boolean;
+        readonly?: boolean;
+
+        // Any object suitable for querystring.stringify()
+        // @see https://nodejs.org/docs/latest-v8.x/api/querystring.html#querystring_querystring_stringify_obj_sep_eq_options
+        queryOptions?: {
+            [key: string]: string | Array<string> | number | Array<number> | boolean | Array<boolean>;
+        };
+    };
+
+    export type QueryCallback = (error?: Error) => void;
+
+    export class RecordStream extends stream.Duplex {}
+
+    export type Value = any;
+
+    export type QueryResult = Array<Array<Value>>;
+}
+
+export = ClickHouse;