added Contribution Guide

Contribution Guide.md

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+## Contribution Guide
+
+This guide will help us ensure that you have a simple and effective way to contribute to this project.
+
+-   If you want to propose a new App Idea, use the [Example Guide](./Example%20Guide.md) as a base template.
+-   Before creating a Pull Request, please make sure that your suggestion is not already added to the project. You can submit an update if this will improve the existing idea.
+-   Make sure you check your spelling and grammar.
+-   Create individual PR for each suggestion.
+-   A Trello Board will be created by one of the Team Members after the PR will get merged.
+
+Thank you for spending time improving this project!