Add DEVELOPMENT.md

Author: Fran Montiel

DEVELOPMENT.md

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+# Setting up the environment
+Install Node & Watchman using Homebrew
+
+For Android, install:
+ - Java Development Kit
+ - Android Studio with Android SDK
+
+For iOS, install:
+ - XCode with command line tools
+ - Cocoapods
+
+Please follow the guide on https://reactnative.dev/docs/environment-setup
+
+# Running the example
+On Android:
+ - Open Android Studio and run an emulator
+ - Execute the following command under the example folder: `yarn android`
+
+On iOS:
+- Execute the following command under the example folder: `yarn ios`
+
+On Web:
+- Please use [this private project](https://bitbucket.org/bugfender/rn-bugfender-development) and execute `yarn web`
+
+## Update React Native version
+Try with the official react native upgrade command:
+```bash
+npx react-native upgrade
+```
+
+If it does not work you can create a new updated library from scratch:
+1. Using [create-react-native-library tool] (https://reactnative.dev/docs/native-modules-setup)
+
+2. Be sure to select a Native library using Java & Objective-C
+
+3. Add the following lines to the `package.json` of the newly created library (be sure to use the latest version):
+```json
+"dependencies": {
+  "@bugfender/common": "1.0.0-alpha.5",
+  "@bugfender/sdk": "^2.1.0"
+}
+```
+
+4. Add "dom" into the "lib" object on `tsconfig.json`:
+```json
+"lib": [
+  "esnext",
+  "dom"
+],
+```
+
+5. On **android/src/build.gradle** add the following to the dependencies:
+```gradle
+implementation 'com.bugfender.sdk:android:3.+'
+```
+
+6. Copy `RnBugfenderModule.java` and `RnBufgenerPackage.java` to **android/src/main/java/com.bugfender.react**
+
+7. Add the Bugfender dependency to the podspec on the **root** folder
+```ruby
+s.dependency 'BugfenderSDK', '~> 1.10.5'
+```
+
+8. Copy `RnBugefnder.h` && `RnBugefnder.mm` to **ios/**
+
+9. Copy `App.tsx` & add  `bugfenderKey.json` into **example/src/**, see `bugfenderKey.json` format below:
+```json
+{
+ "bugfenderKey": "<your Bugfdender key>"
+}
+```
+
+10. Run `pod install` under **example/ios/**
+
+11. You should be ready to run the example using `yarn android` & `yarn ios`