feat: add basic readme

Signed-off-by: kjuulh <contact@kjuulh.io>

README.md

@@ -0,0 +1,94 @@
+# Contractor - A renovate bot for gitea and github
+
+Contractor is a chatops like bot, integrating with github/gitea issues, allowing commands to trigger renovate runs.
+
+```bash
+/contractor refresh	
+```
+
+Contractor runs in a regular docker image and uses the official renovate slim image behind the scenes, this can be changed in the configuration.
+
+![command](./assets/command.png)
+
+## Getting started
+
+First you need to pull and run the contractor image, docker is the preferred way of execution, but golang is also available from source.
+
+Docker compose is given as an example, but you're free to run using `docker run` if you prefer.
+
+See example for a ready-to-run image
+
+```yaml
+# file: docker-compose.yaml
+version: "3"
+services:
+  contractor:
+	  image: docker.io/kjuulh/contractor:latest
+		restart: unless-stopped
+		commands:
+		- contractor server serve
+		volumes:
+	  - "./templates/contractor:/mnt/config"
+		- "/var/run/docker.sock:/var/run/docker.sock"
+		env_file:
+	  - .env
+```
+
+```bash
+# file: .env
+GITEA_RENOVATE_TOKEN=<gitea application token> # needs repo and pull request permissions
+GITHUB_RENOVATE_TOKEN=<github personel access token> # needs repo and pull request permissions
+GITHUB_COM_TOKEN=<github personel access token> # used for communication, doesn't need much
+RENOVATE_SECRETS='{"HARBOR_SERVER_PASSWORD": "<whatever secret you need in your config>"}'
+CONTRACTOR_API_KEY='<some sufficiently secret password used for webhooks to authenticate to your server>'
+```
+
+```json
+// file: templates/contractor/config.json
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "platform": "gitea",
+  "extends": [
+    "config:base"
+  ]
+}
+// Remember to fill out the options as you see fit, this is not a complete example
+```
+
+Use renovate secret for each `{{ secrets.HARBOR_SERVER_PASSWORD }}` in your config, replace `HARBOR_SERVER_PASSWORD` with your own
+
+And then run the server with: `docker compose up`
+
+This has started the server, but github doesn't know that it needs to talk to you yet.
+
+As such host the server somewhere with a public hostname, such that github or gitea webhooks can reach it, i.e. contractor.some-domain.com:9111
+
+To install the webhook, either use the docker image, or download the cli from source.
+
+### CLI
+
+To install the cli
+
+```bash
+go install git.front.kjuulh.io/kjuulh/contractor@latest	
+```
+
+contractor will automatically read any .env file, so you can leave out the secrets.
+
+```bash
+contractor install --owner kjuulh --repository contractor --url https://git.front.kjuulh.io/api/v1 --backend gitea	
+```
+
+If you leave any of these out, contractor will prompt your for required values.
+
+### Docker
+
+You can also use docker for it.
+
+```bash
+docker compose run contractor install --owner kjuulh --repository contractor --url https://git.front.kjuulh.io/api/v1 --backend gitea	
+```
+
+### GitHub App
+
+TBD, this should automatically install the webhook for allowed repositories, I just haven't gotten around to it yet. It is on the 0.3.0 Roadmap.