Add ios and android build instructions

README.md

@@ -1,2 +1,39 @@
 # bigbluebutton-mobile
-Repository for mobile code
+
+BigBlueButton mobile application.
+
+## Development
+
+### Linux
+
+To build this application in linux, you need to run:
+
+```sh
+# Instal Android SDK
+sudo apt install android-sdk
+
+# In one terminal, start metro:
+npx react-native start
+
+# In other terminal, run the app:
+npx react-native run-android
+```
+
+### MAC
+
+To build this application in mac, you need to run:
+
+```sh
+# Install cocoapods gem
+sudo gem install cocoapods
+
+# Install dependencies
+npx pod-install
+
+# In one terminal, start metro:
+npx react-native start
+
+# In other terminal, run the app:
+npx react-native run-ios
+
+```