docs(groupware): add services/groupware/DEVELOPER.md

services/groupware/DEVELOPER.md

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+# Introduction
+
+The Groupware component of OpenCloud
+
+* is implemented as yet another microservice within the OpenCloud framework (see `./services/groupware/`)
+* is essentially providing a REST API to the OpenCloud UI clients (web, mobile) that is high-level and adapted to the needs of the UIs
+* the implementation of that REST API turns those high-level APIs into lower-level [JMAP](https://jmap.io/) API calls to [Stalwart, the JMAP mail server](https://stalw.art/), using our own JMAP client library in `./pkg/jmap/`
+
+# Repository
+
+The code lives in the same tree as the other OpenCloud backend services, albeit in the `groupware` branch, that gets rebased on `main` on a regular basis (at least once per week.)
+
+Use [the `groupware` branch](https://github.com/opencloud-eu/opencloud/tree/groupware)
+
+
+```bash
+cd ~/src/opencloud/
+git clone --branch groupware git@github.com:opencloud-eu/opencloud.git
+```
+
+Also, you might want to check out these [helper scripts in opencloud-tools](https://github.com/pbleser-oc/opencloud-tools) somewhere and put that directory into your `PATH`, as it contains scripts to test and build the OpenCloud Groupware:
+
+
+```bash
+cd ~/src/opencloud/
+git clone git@github.com:pbleser-oc/opencloud-tools.git ./bin
+echo 'export PATH="$PATH:$HOME/src/opencloud/bin"' >> ~/.bashrc
+```
+
+# Running
+
+Either run everything from the Docker Compose `opencloud_full` setup:
+
+
+```bash
+cd deployments/examples/opencloud_full/
+docker compose up -d
+```
+
+or from within VSCode, in which case you should run all the services from the Docker Compose setup as above, but stop the `opencloud` service container (as that one will be running from within your IDE instead):
+
+
+```bash
+docker stop opencloud_full-opencloud-1
+```
+
+and then use the Launcher `OpenCloud server with external services` in VSCode.
+
+To do the latter on a more permanent basis, comment the following line in `deployments/examples/opencloud_full/.env`:
+
+
+```yaml
+#OPENCLOUD=:opencloud.yml
+```
+
+## Feeding an Inbox
+
+Once a Stalwart container is running (using the Docker Compose setup as explained above), use [`imap-filler`](https://github.com/opencloud-eu/imap-filler/):
+
+
+```bash
+cd ~/src/opencloud/
+git clone git@github.com:opencloud-eu/imap-filler.git
+cd ./imap-filler
+EMPTY=true SENDERS=3 \
+USERNAME=alan PASSWORD=demo \
+URL=localhost:993 FOLDER=Inbox COUNT=20 \
+go run .
+```
+
+# Building
+
+If you run the `opencloud` service as a container, use the following script to update the container image and restart it:
+
+
+```bash
+oc-full-update
+```
+
+If you run it from your IDE, there is obviously no need to do that.
+
+# API Docs
+
+The REST API documentation is extracted from the source code structure and documentation using [`go-swagger`](https://goswagger.io/go-swagger/), which needs to be installed locally as a prerequisite:
+
+
+```bash
+go install github.com/go-swagger/go-swagger/cmd/swagger@latest
+```
+
+The build chain is integrated within the `Makefile` in `services/groupware/`:
+
+
+```bash
+cd services/groupware/
+make apidoc-static
+```
+
+That creates a static documentation HTML file using [redocly](https://redocly.com/) named `api.html`
+
+```bash
+firefox ./api.html
+```
+
+Note that `redocly-cli` does not need to be installed, it will be pulled locally by the `Makefile`, provided that you have [pnpm](https://pnpm.io/) installed as a pre-requisite, which is already necessary for other OpenCloud components.
+
+