Create CONTRIBUTING.md

[ahmetcetin]

closes #12

Context:

Describe the code changes of this Pull Request.

Branch Names:

Pick one of the following branch name for your commits:

• feature-* A new feature was added to the codebase
• fix-* A bug was fixed
• refactor-* The code were refactored
• cleanup-* The code were refactored

git checkout -b feature-your-branch

Proposed Changes

• implement feature
• document feature
• test feature
• update version at the Makefile
• make this will build the new source and generate the new docs
• make build-commit if everything pass, we can build and git commit the artifact

The following command need to be exit with code 0 to be merged!

make

[KjellMorgenstern]

Uhm... any help is welcome. But this project is currently unmaintained, and I am not aware of anyone using it.