Update README.md add installation instructions

Signed-off-by: Ajay Bhargav <[email protected]>

Author: ajaybhargav

README.md

@@ -5,3 +5,9 @@ Software development kit for SIWI GSM modules
 [![Documentation Status](https://readthedocs.org/projects/siwisdk/badge/?version=latest)](https://siwisdk.readthedocs.io/en/latest/?badge=latest)
 [![Github Issues](https://img.shields.io/github/issues/siwiembedded/siwisdk.svg)](http://github.com/siwiembedded/siwisdk/issues)
 [![Github Releases](https://img.shields.io/github/release/siwiembedded/siwisdk.svg)](https://github.com/siwiembedded/siwisdk/releases)
+
+
+## Installation Guide
+ - [PlatformIO IDE](https://github.com/siwiembedded/siwisdk/blob/master/docs/book/quick_start.rst#platformio-ide)
+ - [Arduino IDE](https://github.com/siwiembedded/siwisdk/blob/master/docs/book/quick_start.rst#arduino-ide)
+