Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing
+
+Thank you for your interest in contributing to Gem Wallet! If you have any questions, feel free to ask on [Discord](https://discord.gg/aWkq5sj7SY) or [Telegram](https://t.me/gemwallet_developers).
+
+## Feature Requests and Bug Reports
+
+Feature requests and bug reports should be posted as [Github Issues](issues/new).
+In an issue, please describe what you did, what you expected, and what happened instead.
+
+If you think that you have identified an issue with Gem Wallet that might compromise
+its users' security, please do not open a public issue on GitHub. Instead,
+we ask you to refer to [Security Policy](SECURITY.md).
+
+## Sending Pull Requests
+
+There are several ways to identify an area where you can contribute:
+
+* You can reach out by sending a message in the developer community communication channel, either with a specific contribution in mind or in general by saying "I want to help!".
+* Occasionally, some issues on Github may be labelled with `help wanted` or `good first issue` tags.
+
+### Discuss First
+Before sending a feature pull request, it's always better to open a issue first to discuss whether it is desired and the design of the feature. 
+
+### Branch Model
+We use the [Fork and Pull](https://git-scm.com/book/en/v2/Git-Basics-Fork-and-Pull) model and [GitFlow](https://www.atlassian.com/git/tutorials/comparing-workflows/gitflow-workflow) to work on this repository.
+
+Main branch is `master`. This is the branch that is used to work on the official release.
+
+### Commit Convention
+We use [Conventional Commits](https://www.conventionalcommits.org/) for commit messages. Please read the guide through if you aren't familiar with it already.