Add fastsam notebook to docs

Author: giswqs

docs/fast_sam.md

@@ -0,0 +1,3 @@
+# fast_sam module
+
+::: samgeo.fast_sam

mkdocs.yml

@@ -59,6 +59,7 @@ nav:
           - examples/text_prompts_batch.ipynb
           - examples/swimming_pools.ipynb
           - examples/arcgis.ipynb
+          - examples/fast_sam.ipynb
     - API Reference:
           - common module: common.md
           - samgeo module: samgeo.md