Add Contributing.md file

CONTRIBUTING.md

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+# Contributing to MarvelUniverse React App 
+
+See what we've made so far [here](https://marvels.netlify.com/)
+
+The following is a set of guidelines for contributing to MarvelUniverse React App. These are mostly guidelines, not rules. Use your best judgment, and feel free to propose changes to this document in a pull request.
+
+[How Can I Contribute?](#how-can-i-contribute)
+  * [Reporting Bugs](#reporting-bugs)
+  * [Suggesting Enhancements](#suggesting-enhancements)
+  * [Pull Requests](#pull-requests)
+
+Please report unacceptable behavior to [the owner](mailto:[email protected]) of this repo.
+
+> **Note:** Please don't file an issue to ask a question.You'll get faster results by asking one of the contributors.
+
+
+## How can I Contribute
+
+### Reporting Bugs
+
+Bug reports can be of great help all the time! Just head [here](https://marvels.netlify.com/) or run the project locally and start testing stuf!!!
+
+Before opening a new issue please check the already opened issues.
+
+### Suggesting Enhancements
+
+Any suggestion for improvement is worth mentioning.
+
+### Pull Requests
+
+Please try to: 
+
+- Maintain code quality
+- Fix problems that are important to users
+- Enable a sustainable system for the maintainers to review contributions