Add instructions for getting styleguidegit submodule

README.md

@@ -0,0 +1,24 @@
+## Get submodules
+
+This project includes the [Agaric styleguide](https://gitlab.com/agaric/styleguide) as a [git submodule](https://git-scm.com/book/en/v2/Git-Tools-Submodules).
+
+### When cloning
+
+```
+git clone --recurse-submodules git@gitlab.com:agaric/sites/agaric-com.git
+```
+
+### If you cloned without `--recurse-submodules`
+
+If in your initial clone you didn't do as above, you can get the styleguide with:
+
+```
+git submodule init
+git submodule update
+```
+
+### Get updates
+
+```
+git submodule update --recursive --remote
+```