Merge pull request #19 from UN-Task-Team-for-Scanner-Data/housekeeping

add code of conduct and contributing

Author: sergegoussev

CODE_OF_CONDUCT.md

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+# Code of Conduct
+
+We are a community based on openness, as well as friendly and didactic discussions.
+
+We aspire to treat everybody equally, and value their contributions.
+
+Decisions are made based on technical merit and consensus.
+
+Code is not the only way to help the project. Reviewing pull requests,
+answering questions to help others on mailing lists or issues, organizing and
+teaching tutorials, working on the website, improving the documentation, are
+all priceless contributions.
+
+We abide by the principles of openness, respect, and consideration of others of
+the Python Software Foundation: https://www.python.org/psf/codeofconduct/

CONTRIBUTING.md

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+# Contributing
+
+## How to Contribute
+
+When contributing, post comments and discussion changes you wish to make via Issues.
+
+Feel free to propose changes by creating Pull Requests. If you don't have write access, editing a file will create a Fork of this project for you to save your proposed changes to. Submitting a change to a file will write it to a new Branch in your Fork, so you can send a Pull Request.