updated readme

Readme.md

@@ -8,6 +8,18 @@ Contributions are always welcome, hoping people will help me in growing this. To
 
 <a href="https://nisrulz.com/android-tips-tricks" target="_blank" noopener>Click here to navigate to the searchable book version</a>
 
+
+### Development
+
+#### Build Book
+```mdbook build```
+
+#### Build book and serve locally
+```mdbook serve --open```
+
+#### Build book and publish to Github Pages
+```./deploy-to-github-pages.sh```
+
 ### Show some ♥️ and 🌟 the repo to support the project
 
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