Fix #176 Add CONTRIBUTING.md

CONTRIBUTING.md

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+## How to Contribute
+
+### Raising an issue:
+
+This is an Open Source project and we would be happy to see contributors who report bugs and file feature requests submitting pull requests as well.
+This project adheres to the Contributor Covenant code of conduct.
+By participating, you are expected to uphold this code style.
+Please report issues here [Issues - openMF/ppi-vision](https://github.com/openMF/ppi-vision/issues)
+
+### Branch Policy
+
+#### Sending pull requests:
+
+Go to the repository on GitHub at https://github.com/openMF/ppi-vision .
+
+Click the “Fork” button at the top right.
+
+You’ll now have your own copy of the original ppi-vision repository in your GitHub account.
+
+Open a terminal/shell.
+
+Type
+
+`$ git clone https://github.com/username/ppi-vision`
+
+where 'username' is your username.
+
+You’ll now have a local copy of your version of the original ppi-vision repository.
+
+#### Change into that project directory (ppi-vision):
+
+`$ cd ppi-vision`
+
+#### Add a connection to the original ppi-vision repository.
+
+`$ git remote add upstream https://github.com/openMF/ppi-vision`
+
+#### To check this remote add set up:
+
+`$ git remote -v`
+
+#### Make changes to files.
+
+`git add` and `git commit` those changes
+
+`git push` them back to GitHub. These will go to your version of the repository.
+
+
+#### Now Create a PR (Pull Request)
+
+Go to your version of the repository on GitHub.
+
+Click the “New pull Request” button at the top.
+
+Click the green button “Create pull request”. Give a succinct and informative title, in the comment field give a short explanation of the changes and click the blue button “Create pull request” again.
+
+#### Pulling others’ changes
+
+Before you make further changes to the repository, you should check that your version is up to date relative to original version.
+
+Go into the directory for the project and type:
+
+`$ git checkout <branch under development>`
+
+`$ git pull upstream master --rebase`
+
+This will pull down and merge all of the changes that have been made in the original ppi-vision repository.
+
+Now push them to your GitHub repository.
+
+`$ git push origin <branch under development>`