add CONTRIBUTING.md

Author: AnupKumarPanwar

CONTRIBUTING.md

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+# Contributing guidelines
+
+## Before contributing
+
+Welcome to [TheAlgorithms/website](https://github.com/TheAlgorithms/website)! Before sending your pull requests, make sure that you **read the whole guidelines**. If you have any doubt on the contributing guide, please feel free to [state it clearly in an issue](https://github.com/TheAlgorithms/website/issues/new) or ask the community in [Gitter](https://gitter.im/TheAlgorithms).
+
+## Contributing
+
+This repo contains the frontend code for the website, so it is recommended to host the static pages somewhere. It makes the PR review easier as changes can be easily seen.
+You can use [surge.sh](https://surge.sh/) for this. It is a Static web publishing for Front-End Developers. 
+