README.md: add README

README.md

@@ -1 +1,46 @@
 # Lava
+
+Lava is an open source vulnerability scanner that makes it easy to run
+security checks in your local and CI/CD environments.
+
+Lava is part of the [Vulcan ecosystem][vulcan-docs] and it is built on
+top of the same components that power Vulcan.
+Thus, Lava continuously benefits from Vulcan improvements.
+In fact, Lava is compatible with the [vulcan-checks][vulcan-checks]
+catalog shipped with Vulcan.
+
+## Install
+
+### Install From Source
+
+Install the Lava command with `go install`:
+
+```
+go install github.com/adevinta/lava/cmd/lava@latest
+```
+
+### GitHub Actions
+
+Lava is also available as an action that can be used from GitHub
+Actions workflows.
+Visit [adevinta/lava-action][lava-action] for usage instructions.
+
+## Documentation
+
+Lava is self-documented.
+Please run `lava help` to get more information about the available
+commands and other related topics.
+
+## Contributing
+
+**This project is in an early stage, we are not accepting external
+contributions yet.**
+
+To contribute, please read the [contribution
+guidelines][contributing].
+
+
+[vulcan-docs]: https://adevinta.github.io/vulcan-docs
+[vulcan-checks]: https://github.com/adevinta/vulcan-checks
+[lava-action]: https://github.com/adevinta/lava-action
+[contributing]: /CONTRIBUTING.md