Add more information to CONTRIBUTING.MD

CONTRIBUTING.md

@@ -1,6 +1,29 @@
 # Contributing
 
-If you're thinking about contributing to Patrol, thank you! We appreciate your help.
+If you're thinking about contributing to Patrol, thank you! We appreciate your help. Before you get started, we encourage you to read this document. It should make your contributing experience a bit better.
+
+## Opening a PR
+
+Before opening a PR with your changes, make sure you have updated the changelog for the package you modified.
+
+In the PR description mention the issue that this PR resolves. If that issue doesn't exist, create one or describe in detail the changes introduced by this PR.
+
+Use `## Unreleased` title if you're not sure what should be next version number. 
+
+Be aware that `test android emulator` and `test android emulator webview` workflows will fails due to insufficient permission of a contributor. Those will have to be re-run by someone with the write access in the repository.
+
+## Running patrol_cli locally
+
+If you want to work with a local version of patrol_cli, you can pick one of two approaches:
+
+Activate patrol_cli locally by typing `dart pub global activate --source path [path to packages/patrol_cli]`. After that you can use `patrol` command exactly the same as any other pub package. 
+
+   OR
+
+Use `dart run [path to packages/patrol_cli] <command you want to test>`.
+
+## Debugging patrol_cli 
+
 Changes to Patrol CLI can be debugged using the following configuration:
 
 ### Visual Studio Code
@@ -44,3 +67,15 @@ project you want to test and updating paths to the target tests in `arguments`.
   </configuration>
 </component>
 ```
+
+## Implementing native interactions
+
+Native methods API is generated from a schema. If you wish to modify any of these methods, follow steps from below:
+
+1. Go to `schema.dart` in the root directory of the repository.
+2. Find a method or a request/response class that you wish to modify, apply your changes.
+3. Run `./gen_from_schema` script to regenerate the contracts.
+
+## Working with patrol_devtools_extension 
+
+If you plan to use the local version of Patrol to test/modify the Patrol DevTools extension, you need to deploy it first. To do this, navigate to the `patrol_devtools_extension` folder and run the `./publish_to_patrol_extension` script.