create development guide

remove deps badge

correct mongo connection string and driver update

seed data for developer environment, database as docker image

CONTRIBUTING.md

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+# Contributing
+
+When contributing to this repository, please first discuss the change you wish to make via a GitHub issue.
+
+## Development Environment Setup
+
+### Prerequisites
+- [Yarn](https://classic.yarnpkg.com/lang/en/docs/install/#debian-stable)
+- [Docker](https://docs.docker.com/engine/install/)
+
+### Setup
+1. Fork the repository
+2. Clone your fork locally
+3. Run `yarn` to install dependencies
+4. Run `docker-compose up` to start the MongoDB database and seed it with test data
+5. Run `yarn dev` to start the development server
+
+The test data is not persisted between restarts. Create a Docker volume if you wish for this to be the case.
+
+### Branching
+- We use the [GitHub Flow](https://www.gitkraken.com/learn/git/best-practices/git-branch-strategy#github-flow-considerations) branching strategy.
+- Use `feature/feature-name` as your branch name.
+- Non-feature branches are allowed, but please give a clear name to your branch such as `hotfix/fix-bug`
+
+## Pull Request Process
+1. Squash all your commits into a single commit before pushing your branch
+2. Give a clear overview of your changes in the commit message
+3. When opening a PR, give a clear overview of what your changes are and why
+4. Wait for review and approval