Create CONTRIBUTING.md

added contribution guidelines

CONTRIBUTING.md

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+# How to contribute
+
+:sparkles: First off, thanks for taking the time to contribute! :sparkles:
+
+The following is a quick set of guidelines for contributing to Iconoir.
+
+## Pull Requests
+
+> :information_source: **Note:** At the moment we are not accepting pull requests containing _**icons**_. The best way to contribute an icon is to create an issue with a screenshot and link to an SVG of your icon.
+
+Pull requests for new features, bug fixes, etc. are often appreciated.
+
+:point_right: We're looking for help with fonts and libraries.
+
+Guidelines for pull requests:
+- __Make your commit messages as descriptive as possible.__ Include as much information as you can. Explain anything that the file diffs themselves won’t make apparent.
+- __Target Master__. Most of bugfix or new feature should go to the `master` branch.
+- __Include only related work__. If your pull request has unrelated commit, it won't be accepted.
+- __Packages and Libraries__. If you're adding or updating a package or React/Vue library the target folder is `/packages/[LIBRARY_NAME]`.
+- __Fonts__. If you're adding or updating fonts the target folder is `/fonts/`.
+
+## Icon Requests
+
+Before creating an icon request, please search to see if someone has requested the icon already. If there is an open request, please upvote it.
+
+If the icon has not already been requested, [create an issue](https://github.com/lucaburgio/iconoir/issues/new/choose) and add as much information as possible.
+Follow the rules you see when opening a new bug report.
+
+## Bug Reports
+
+Before reporting an issue, please search to see if someone has filed a similar issue before. If there is already an open issue, please upvote it and/or leave a comment with additional information.
+Follow the rules you see when opening a new bug report.