docs: updating README page

Signed-off-by: Pawel Psztyc <[email protected]>

Author: jarrodek

README.md

@@ -1,12 +1,30 @@
 # Advanced REST Client application
 
-This is the main repository for the ARC Electron application
+This is the main repository for the ARC Electron application.
 
-Tis is work in progress.
+## Documentation
 
-To try this version of the application:
+If you are looking for the **documentation** then visit [docs.advancedrestclient.com](https://docs.advancedrestclient.com/).
 
-Cone the repository:
+## Installation
+
+If you are looking to install the application, the go to [the releases page](https://github.com/advanced-rest-client/arc-electron/releases) and download the installer for your system.
+
+1. Find the latest stable release.
+2. Toggle the `Assets` and find the installer for your system. For Windows it will be `arc-setup.exe`. macOS users should download `arc-x.x.x.dmg`, where `x.x.x` is the version number. Linux users should find the distribution corresponding to the system you are using.
+3. Run the installer by clicking on it.
+
+Note that you may be asked to use an account with upgraded privileges to install the application.
+
+## Project planning
+
+We believe in open web and open API tooling. The project is managed in an open way and you can also contribute by requesting features and reporting issues. You can check current planning in the [project plan](https://github.com/orgs/advanced-rest-client/projects/2).
+
+## Contributing to the project
+
+Get familiar with the [application architecture](https://app.gitbook.com/@api-components/s/arc/arc-development/architecture). You may also want to look into the `.github/CONTRIBUTING.md` document before you jump into the development.
+
+Clone the repository:
 
 ```sh
 git clone https://github.com/advanced-rest-client/arc-electron.git