Update CONTRIBUTING.md

Author: devjewel01

CONTRIBUTING.md

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-everyone can contribute in our project.
+This project is only educational purpose. Everyone can contribute in our project.
+
+
+<h2 id="Contribution">Looking for contributors!</h2>
+Looking for contributors to help build out the Robot. There are a lot of work to do. This would be a good oppurtunity to learn Robotics, ROS, Machine Learning and how to Engineer an entire Robot system from the ground up. You can add your any idea to our project.
+
+<br>
+
+### Contribution guidelines 
+Follow these algorithms to contribute to the voice assistant project. 
+- Fork this repository 
+- Add your any idea to the project. Or 
+- Select your comfortable issues given in issues feature [click here to see the issues](https://github.com/devjewel01/Robot-Niko).
+- Try to solve the mentioned issues and make a pull request by using branch folder 🌿 .
+- Stricly maintain the clear commit name and message.
+- Make a pull request to this repository ❤