docs: Update README.md with instructions on using the docker composition

Signed-off-by: Alf-Rune Siqveland <alf.rune@northern.tech>

README.md

@@ -1,2 +1,54 @@
 # mender-server
 Mender Server monorepo
+
+## Getting started
+
+Before you start the Mender server, make sure you have [Docker Compose](https://docs.docker.com/compose/install/) installed.
+Mender server requires Docker Compose version `v2.21.0` or newer.
+```
+docker compose version
+```
+
+> [!NOTE]
+> This docker composition is only meant for evaluation purposes.
+> Please use [the helm chart](https://github.com/mendersoftware/mender-helm) in production environments.
+
+To start evaluating Mender, you can bring up your Mender server by running:
+```
+docker compose up -d
+```
+
+Once all containers are running, you can create your initial user using the following command:
+```
+MENDER_USERNAME=admin@mender.local
+MENDER_PASSWORD=password123
+docker compose exec useradm useradm create-user --username "$MENDER_USERNAME" --password "$MENDER_PASSWORD"
+```
+
+Visit [https://localhost](https://localhost) and sign in using the credentials from the snippet above.
+
+### Evaluating Mender enterprise
+
+> [!WARNING]
+> We strongly advise using [the helm chart](https://github.com/mendersoftware/mender-helm) for production setups.
+> This docker composition is only meant for evaluation purposes.
+
+For paying customers with access to private enterprise components, you can evaluate the Mender Server enterprise by replacing the above snippets from the following section.
+To start the server run:
+```
+export COMPOSE_FILE="docker-compose.yml:compose/docker-compose.enterprise.yml"
+docker compose up -d
+```
+
+> [!IMPORTANT]
+> This composition will not work without a paid license with access to registry.mender.io.
+
+To initialize the admin user, use the following snippet:
+```
+MENDER_NAME=Admin
+MENDER_USERNAME=admin@mender.local
+MENDER_PASSWORD=password123
+docker compose exec tenantadm create-org --username "$MENDER_USERNAME" --password "$MENDER_PASSWORD" --name "$MENDER_NAME"
+```
+
+Visit [https://localhost](https://localhost) and sign in using the credentials from the snippet above.