docs: 📝 added CONTRIBUTING.md

Author: nabadeep25

CONTRIBUTING.md

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+# Contributing to Typescript-Node-Sequelize-Boilerplate
+
+
+#  Instructions
+## Create an isuue
+ - First of all, open an issue in the repository,
+   describing the contribution you would like to make, the bug you found or any
+   other ideas you have. 
+
+
+## Fixing issues
+ - Fork the project in your account and create a branch with your fix:
+   `feat/your-feature` or `fix/some-issue`.
+
+ - Commit your changes in that branch, 
+
+
+## Creating a pull request
+
+ - Open a pull request, and reference the initial issue in the pull request
+   message (e.g. *fixes #<your-issue-number>*). Write a good description and
+   title, so everybody will know what is fixed/improved.
+
+ - If it makes sense, add screenshots, gifs etc., so it is easier to see what
+   is going on.
+
+## Review
+Before accepting your contributions, request will be reviewed. You may get feedback
+about what should be fixed in your modified code. If so, just keep committing
+in your branch and the pull request will be updated automatically.
+
+## Final
+Finally, your contributions will be merged
+
+Thanks!
+
+