docs(store): add STORE.yaml, MODULE.md/de + icon for the store

Signed-off-by: flemming-it <sf@flemming.it>

MODULE.md

@@ -0,0 +1,21 @@
+# stats.cohort_size
+
+Resolve addressee cohort sizes
+
+## What it does
+
+Resolves the size of an addressee cohort (e.g. 'Berlin SMEs by WZ code'). v0.1 ships a stub table for the pilot cohorts; v0.2 adds a DESTATIS GENESIS-API adapter.
+
+## How to use
+
+```yaml
+steps:
+  - id: step
+    use: stats.cohort_size@^0
+    with:
+      # see inputs in module.yaml
+```
+
+## License
+
+Apache-2.0 — part of the Recl∆Im module set (Flemming.AI), built on Ch∆In.