Add CONTRIBUTING.md (#3)

Author: MadhavBahl

CONTRIBUTING.md

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+# Contributing
+
+When contributing to this repository, please first discuss the change you wish to make via issue, email, or any other method with the mentors/admin of this repository before making a change.
+
+Please follow the mentioned code of conduct which will ensure the health and longevity of this community.
+
+## Issue "Assign" Process
+
+- **Claim** an issue before working on it. Either comment there or ask your mentors. If no one's working on that, they'll assign you. Start working only once you're **assigned**
+
+- Participants **cannot** claim more than one issue at a time, in a project.
+
+- Admins and mentors can specify a **time limit** for participants to complete the issue according to difficulty. They **can** unassign you if you fail to give updates in given time limit. If you need more time & working on it, **ask** them before deadline.
+
+## Pull Request Process
+
+1. Ensure any install or build dependencies are removed before the end of the layer when doing a build.
+
+2. Ensure that the tests are passing.
+
+3. Check that there are no conflicts.
+
+4. Give the description of the issue that you want to resolve in the pull request message. The format of the commit message to be fixed - Fixes #[issue number] [Description of the issue]
+
+5. Wait for the maintainers to review your pull request and do the changes if requested.
+
+## Code of Conduct
+
+- Exercise consideration and respect in your speech and actions.
+
+- Attempt collaboration before conflict. 
+
+- Refrain from demeaning, discriminatory, or harassing behavior and speech.
+
+- Be mindful of your surroundings and of your fellow participants.
+
+- Alert the trust committee if you notice a dangerous situation, someone in distress, or violations of this Code of Conduct, even if they seem inconsequential. 
+
+-  If you witness any such behavior feel free to report to the organizing team.
+
+### Our Pledge
+
+In the interest of fostering an open and welcoming environment, we as
+contributors and maintainers pledge to making participation in our project and
+our community a harassment-free experience for everyone, regardless of age, body
+size, disability, ethnicity, gender identity and expression, level of experience,
+nationality, personal appearance, race, religion, or sexual identity and
+orientation.
+
+### Our Standards
+
+Examples of behavior that contributes to creating a positive environment
+include:
+
+* Using welcoming and inclusive language
+* Being respectful of differing viewpoints and experiences
+* Gracefully accepting constructive criticism
+* Focusing on what is best for the community
+* Showing empathy towards other community members
+
+Examples of unacceptable behavior by participants include:
+
+* The use of sexualized language or imagery and unwelcome sexual attention or
+advances
+* Trolling, insulting/derogatory comments, and personal or political attacks
+* Public or private harassment
+* Publishing others' private information, such as a physical or electronic
+  address, without explicit permission
+* Other conduct which could reasonably be considered inappropriate in a
+  professional setting
+
+### Our Responsibilities
+
+Project maintainers are responsible for clarifying the standards of acceptable behavior and are expected to take appropriate and fair corrective action in response to any instances of unacceptable behavior.
+
+Project maintainers have the right and responsibility to remove, edit, or
+reject comments, commits, code, wiki edits, issues, and other contributions that are not aligned to this Code of Conduct, or to ban temporarily or permanently any contributor for other behaviors that they deem inappropriate, threatening, offensive, or harmful.