docs: info about testing via fmtm

Author: spwoodcock

docs/testing-visually.md

@@ -22,3 +22,24 @@ If you wish to view the split data output in a more visual way:
 5. Copy the data from `output/output.geojson` to geojson.io to visualise.
 
 ## Option 2: FMTM
+
+1. Setup FMTM:
+
+   ```bash
+   git clone https://github.com/hotosm/fmtm.git
+   cd fmtm
+   cp .env.example .env
+
+   # Open docker-compose.yml and uncomment
+   - ../osm-rawdata/osm_rawdata:/home/appuser/.local/lib/python3.10/site-packages/osm_rawdata
+
+   # Run FMTM
+   docker compose up -d
+   ```
+
+2. Go to the [FMTM dashboard](http://fmtm.localhost:7050/)
+3. Create a new project.
+4. Upload your project AOI.
+5. Upload or generate a data extract.
+6. On the task splitting page, select `Task Splitting Algorithm`.
+7. Then click `Click to generate tasks` to see the algorithm output.