feat: add contributing

Author: migmartri

CONTRIBUTING.md

@@ -0,0 +1,60 @@
+# Contributing to Chainloop Core
+
+Chainloop Core maintainers welcome contributions from the community and first want to thank you for taking the time to contribute!
+
+This project and everyone participating in it is governed by the [Code of Conduct](./CODE_OF_CONDUCT.md) before contributing. By participating, you are expected to uphold this code.
+
+## I Have a Question
+
+> If you want to ask a question, we assume that you have read the available [Documentation](https://docs.chainloop.dev).
+
+Before you ask a question, it is best to search for existing [Issues](https://github.com/chainloop-dev/chainloop/issues) that might help you. In case you have found a suitable issue and still need clarification, you can write your question in this issue. It is also advisable to search the internet for answers first.
+
+If you then still feel the need to ask a question and need clarification, we recommend the following:
+
+- Open an [Issue](https://github.com/chainloop-dev/chainloop/issues/new).
+- Provide as much context as you can about what you're running into.
+
+We will then take care of the issue as soon as possible.
+
+## Development
+
+### Chainloop Components
+
+- `app/controlplane`
+- `app/artifact-cas`
+- `app/cli`
+
+See makefiles in those directories for more information
+
+### Using Docker Compose
+
+You can run the core services (controlplane and CAS) and associated dependencies (postgresql) by running
+
+```
+docker compose up
+```
+
+Then, the CLI can be run by doing
+
+```
+docker compose run --rm cli
+```
+
+Note that changes made in the source code are not reflected automatically in the running services, for that you'll need to perform a restart.
+
+```
+docker compose restart -t0 controlplane
+# or
+docker compose restart -t0 cas
+```
+
+### Locally
+
+Prerequisites
+
+- postgresql
+
+Note: You can run the prerequisites by leveraging the provided docker-compose file i.e `docker compose up postgresql`
+
+Then each project has a `make run` target that can be used