fix: fixed contributing document to make pull request to main

The Contributing MD was guiding to make PR for develop branch which does not exists instead of that added main branch in document.

CONTRIBUTING.md

@@ -35,7 +35,7 @@ flutter doctor
 flutter pub get
 ```
 
-%. Run the app:
+5. Run the app:
 
 ```bash
 flutter run
@@ -60,9 +60,17 @@ ___
 ## Contributing
 
 1. Fork the Project
-2. Create your Feature Branch (`git checkout -b feature/AmazingFeature`)
-2. Create your Fix Branch (`git checkout -b fix/BugFix`)
-3. Add all files(`git add .`)
-3. Commit your Changes (`git commit -m 'Add some AmazingFeature'`)
-4. Push to the Branch (`git push origin feature/AmazingFeature`)
-5. Open a Pull Request in the **develop branch**
+2. Clone the Forked Repo. `git clone https://github.com/[username]/taskwarrior-flutter.git`
+3. Create a branch
+	- For your Feature Branch (`git checkout -b feature/AmazingFeature`)
+	- For your Fix Branch (`git checkout -b fix/BugFix`)
+4. Do the changes in that branch
+5. Add all files (`git add .`)
+	- Do Not add files generated by code editor of Android Studio IDE
+	- Only add files that related to your feature
+6. Commit your Changes (`git commit -m 'Add some AmazingFeature'`)
+7. Make sure branch is synced with main branch of `CCExtractor/taskwarrior-flutter`
+	- If not, please sync it and test again
+	- If any conflict, resolve according to feature and test again
+7. Push to the Branch (`git push origin feature/AmazingFeature`)
+8. Open a Pull Request for the `main` branch.