Update Readme.md (#12)

Author: rohitrajhans

Diff for: README.md

@@ -1,3 +1,26 @@
 # BITS-ACM Tech Blog:
 * Made with Jekyll and Markdown    
 * Link: https://bitsacm.github.io  
+
+#### Local Development
+ 
+ 1. Pre-requisites - Ruby (version 2.5 or above) and RubyGems  
+    ```
+    sudo apt-get install ruby ruby-dev build-essential
+    echo '# Install Ruby Gems to ~/gems' >> ~/.bashrc
+    echo 'export GEM_HOME=$HOME/gems' >> ~/.bashrc
+    echo 'export PATH=$HOME/gems/bin:$PATH' >> ~/.bashrc
+    source ~/.bashrc
+    ```
+ 2. Install Jekyll
+    ```
+    gem install jekyll bundler
+    ```
+ 3. Build and Run on local server to test changes
+    ```
+    bundle exec jekyll serve
+    ```
+ Further Links
+  - [Jekyll Quick Start Guide](https://jekyllrb.com/docs/quickstart/)
+  - Complete guide for [Ubuntu](https://jekyllrb.com/docs/installation/#ubuntu) and [macOS](https://jekyllrb.com/docs/installation/#macOS)
+  - How to setup on [Windows](https://jekyllrb.com/docs/windows/)