docs: update README

README.asciidoc

@@ -1 +1,61 @@
 = Flow Services
+
+== Overview
+
+The repository manages the services hosted on Flow Platform with the use of https://go.dev[Go] and https://magefile.org/[Mage].
+
+== Currently hosted services
+
+[%header,cols=3*]
+|===
+|Name
+|Description
+|Link
+
+|Landing
+|The front page of the Flow Platform.
+|https://dananglin.me.uk
+
+|Free Flow
+|A single-user ActivityPub instance powered by https://docs.gotosocial.org/en/latest/[GoToSocial].
+|https://freeflow.dananglin.me.uk
+
+|Code Flow
+|The Flow Platform's software forge powered by https://forgejo.org/[Forgejo].
+|https://codeflow.dananglin.me.uk
+
+|Work Flow
+|A simple CI engine powered by https://woodpecker-ci.org/[Woodpecker].
+|https://workflow.dananglin.me.uk
+|===
+
+== Mage targets
+
+[source,console]
+----
+$ mage -l
+Targets:
+  clean       cleans the workspace.
+  deploy      deploys the services to the Flow Platform.
+  prepare     prepares the service's build directory.
+  shutdown    shuts down the Flow Platform in a given environment.
+  stop        stops a running service within the Flow Platform.
+----
+
+== Deployment guide
+
+The `config` directory contains the Flow Platform's configuration (e.g. versions of hosted software, etc). It is a submodule of a hidden repository due to the sensitive nature of the configuration.
+
+1. _(Optional)_ Run `mage prepare <environment> <service>` to run preparations before deployment. Here the relevant files to run the service are downloaded, templates are rendered and static assets are copied to the build directory (if required). Step is optional because the 'deploy' stage automatically runs 'prepare' as a dependency. For example:
++
+[source,console]
+----
+mage prepare production forgejo
+----
+
+2. To deploy changes to Platform, run `mage deploy <environment> <service>`. The deploy target runs the prepare target as a dependency. For example:
++
+[source,console]
+----
+mage deploy production forgejo
+----