readme: add it

README.md

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+# Autotest Development
+
+This repository contains submodules of all the autotesting related repositories needed to run the autotester.
+
+This is meant to facilitate development of these submodules since this module includes a docker-compose.yml file which creates a development environment in docker for each of the backends with all of the testers and plugins installed.
+
+For example, to start the classic autotester backend and api:
+
+```
+docker compose up backend_classic
+```
+
+to start the docker autotester backend and api:
+
+```
+docker compose up backend_docker
+```
+
+to start the api by itself without any backend:
+
+```
+docker compose up api
+```
+
+The api will accept http requests over the `markus_dev` network at `autotest-api:5000`.
+
+
+If you create a new backend, plugin, or tester make sure to add it as a submodule to this repository:
+
+- new backends should be added in the repository root (and add a new service to the docker-compose.yml file)
+- new testers should be added in the testers/ subdirectory
+- new plugins should be added in the plugins/ subdirectory