Add contributing guidelines

docs/CONTRIBUTING.md

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+# Contributing to GraphQL Schema Decorator
+
+:+1::tada: First off, thanks for taking the time to contribute! :tada::+1:
+
+The following is a set of guidelines for contributing to GraphQL Schema Decorator,
+which is hosted in the [GraphQL Schema Decorator](https://github.com/indigotech/graphql-schema-decorator) on GitHub.
+These are just guidelines, not rules, use your best judgment and feel free to
+propose changes to this document in a pull request.
+
+## Submitting Issues
+
+* You can create an issue [here](https://github.com/indigotech/template-node/issues), but before doing it, please read the notes below on submitting issues.
+* The issue title should have the issue type, like in the following example: `[BUG] Endpoint does not work`.
+* Include screenshots or pieces of code whenever possible, they are very helpful.
+* Include as many details as possible about your report.
+
+## Pull Requests
+
+* Use the following examples branch name pattern:
+  - `feature/add-endpoint`  
+  - `bugfix/missing-fields`
+  - `enhancement/add-fields`
+  - `docs/update-readme`
+  - `chore/config-staging`
+
+* Reference issues when creating the pull request. Make sure to add a reference to the issue like this: `Issue #48`.
+* Make sure to create test for all feature added. Also run the test before commiting any changes: `npm test`.
+* Verify if there are any documents in need of updates.
+* Include screenshots and animated GIFs in your pull request whenever possible.
+
+## Git Commit Messages
+
+* Use the present tense ("Add feature" not "Added feature")
+* Limit the first line to 72 characters or less