Created Contribution Guidelines

CONTRIBUTING.md

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+# Contribution Guidelines
+
+Thank you for contributing to this list of helpful resources for voice app developers 🎉
+Please note that this project is released with a [Contributor Code of Conduct](code-of-conduct.md). By participating in this project you agree to abide by its terms.
+
+## Table of Contents
+
+- [Adding to this list](#adding-to-this-list)
+- [How to add to this list](#how-to-add-to-this-list)
+- [Updating your Pull Request](#updating-your-pull-request)
+
+## Adding to this list
+
+Please ensure your pull request adheres to the following guidelines:
+
+- Search previous suggestions before making a new one, as yours may be a duplicate.
+- Use the following format: `[Title](link): Description`
+- Link additions should be added to the bottom of the relevant category.
+- New categories or improvements to the existing categorization are welcome.
+- Check your spelling and grammar.
+- Make sure your text editor is set to remove trailing whitespace.
+- The pull request and commit should have a useful title.
+- The body of your commit message should contain a link to the repository.
+
+Thank you for your suggestions!
+
+## How to add to this list
+
+If you have something awesome to contribute to this list, this is how you do it.
+
+You'll need a [GitHub account](https://github.com/join)!
+
+1. Access this list's GitHub page: https://github.com/jovotech/awesome-voice-apps
+2. Click on the `readme.md` file
+3. Now click on the edit icon
+4. You can start editing the text of the file in the in-browser editor. Make sure you follow guidelines above. You can use [GitHub Flavored Markdown](https://help.github.com/articles/github-flavored-markdown/)
+5. Say why you're proposing the changes, and then click on "Propose file change"
+6. Submit the [pull request](https://help.github.com/articles/using-pull-requests/)!
+
+## Updating your Pull Request
+
+Sometimes, a maintainer of an awesome list will ask you to edit your Pull Request before it is included. This is normally due to spelling errors or because your PR didn't match the awesome-* list guidelines.
+
+[Here](https://github.com/RichardLitt/docs/blob/master/amending-a-commit-guide.md) is a write up on how to change a Pull Request, and the different ways you can do that.