Create CONTRIBUTING.md

Author: kanthvallampati

.github/CONTRIBUTING.md

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+# Contributing
+
+Thanks for your interest in contributing to IVORY UI. Please take a moment to review this document before submitting a pull request.
+
+## Contribution
+
+You can contribute to 3 following areas:
+- Desgin new icons
+- Documentation
+- Create New Component or Enhancement
+
+## Pull requests
+
+**Please ask first before starting work on any significant new features.**
+
+It's never a fun experience to have your pull request declined after investing a lot of time and effort into a new feature. To avoid this from happening, we request that contributors create [an issue](https://github.com/ivory-ui/ivory/issues) to first discuss any significant new features.
+