Add basic README

README.md

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+# Dolphin Central
+
+Central is the infrastructure component receiving webhooks and coordinating
+builds, status updates, notifications, etc. for Dolphin's CI/CD infrastructure.
+
+It provides plumbing to connect the following systems together:
+- GitHub
+- IRC
+- Buildbot
+- FifoCI
+
+This is not meant as a general purpose system, it is custom made for Dolphin's
+needs and likely not directly usable for other projects.
+
+## Setup
+
+```bash
+$ nix run
+```
+
+## Development
+
+```bash
+$ nix develop
+$ poetry install
+$ poetry run black --check .
+$ poetry run pytest
+$ poetry run central
+```