docs(contribution): added contribution guidelines for the project

Author: sankhesh

CONTRIBUTING.md

@@ -0,0 +1,84 @@
+# Contributing to react-vtk-js
+---
+
+We welcome you to join the development of react-vtk-js. This document will help you through the process.
+
+## Before You Start
+
+Please follow the coding style:
+
+- Follow [Airbnb JavaScript Style Guide](https://github.com/airbnb/javascript).
+- Use soft-tabs with a two space indent.
+- Don't put commas first.
+
+## Workflow
+
+1. The react-vtk-js source is maintained [on GitHub](https://github.com/kitware/react-vtk-js).
+2. [Fork react-vtk-js](https://help.github.com/articles/fork-a-repo/) into your user's namespace on GitHub.
+3. Clone the repository to your computer.
+
+    ```sh
+    $ git clone https://github.com/<username>/react-vtk-js.git
+    $ cd react-vtk-js
+    ```
+
+4. Configure the upstream remote and update the local master branch
+
+    ```sh
+    $ git remote add https://github.com/kitware/react-vtk-js.git
+    $ git fetch upstream --prune --tags
+    $ git checkout master
+    $ git pull upstream master
+    ```
+
+4. Run the install script for react-vtk-js dependencies:
+    ```sh
+    $ npm install
+    ```
+
+5. Create a feature branch.
+
+    ```
+    $ git checkout -b new_feature
+    ```
+
+4. Start hacking.
+
+    ```sh
+    $ edit file1 file2 file3
+    $ git add file1 file2 file3
+    ```
+
+5. Use Commitizen to create commits
+
+    ```sh
+    $ npm run commit
+    ```
+
+6. Push commits in your feature branch to your fork in GitHub:
+
+    ```sh
+    $ git push origin new_feature
+    ```
+
+7. Visit your fork in Github, browse to the "**Pull Requests**" link on the left, and use the 
+   "**New Pull Request**" button in the upper right to create a Pull Request.
+
+    For more information see: 
+    [Create a Pull Request](https://help.github.com/articles/creating-a-pull-request/)
+
+8. react-vtk-js uses GitHub for code review and Github Actions to validate proposed patches before they are merged.
+
+## Notice
+
+- Don't modify the version number in `package.json`. It will be automatically updated after the PR
+  is merged.
+
+## Reporting Issues
+
+If you encounter problems using react-vtk-js you may be able to find the solutions in the
+[vtk-js troubleshooting docs](https://kitware.github.io/vtk-js/docs/misc_troubleshooting.html), in an 
+existing [GitHub issue](https://github.com/kitware/react-vtk-js/issues), or via the 
+[VTK discourse page](https://discourse.vtk.org/).
+If you can't find the answer, please 
+[report a new issue on GitHub](https://github.com/Kitware/react-vtk-js/issues/new).