Merge #2: doc: update basic readme

f0d48b3 doc: update basic readme (Cameron Garnham)

Pull request description:

ACKs for top commit:
  da2ce7:
    ACK f0d48b3

Tree-SHA512: 3ab033a5396c80de716e4266b8a846c4b17f8498c28e7bbf46f50742cc5d1eba1a210cb2a4f7cdd5317c78cca2697188a6f29e0f180cf747d6166ad5e4703c5d

Author: da2ce7

README.md

@@ -1,4 +1,10 @@
-A simple TypeScript/ES6 library that contains API calls used by the Torrust Index project.
+# Torrust Index Application Interface
+
+A simple TypeScript/ES6 library that contains API calls used by the [Torrust Index](https://github.com/torrust/torrust-index) project.
+
+* [Torrust Index Backend](https://github.com/torrust/torrust-index-backend) is our reference implementation of this interface.
+* [Torrust Index Frontend](https://github.com/torrust/torrust-index-frontend) is our reference web-application that consumes this interface.
+
 
 ## Install