Add README.md for custom multiloader template instructions

Took 10 minutes

Author: Xyndra

README.md

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+# Custom Multiloader Template
+
+This is my own custom multi-loader template, and it is not open-source, it is
+source-available. I don't really mind if you use it, but I do not take responsibility
+and I will get very angry if you try to impersonate me due to default settings.
+
+Run this to install the template:
+
+```bash
+npx github:Xyndra/CustomMultiloaderTemplate#template-helper
+```
+
+Note that this requires Node.js and Git to be installed on your system.