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 @@
+# text.readability_score
+
+Composite readability and complexity score
+
+## What it does
+
+Composite readability score for any text — DE-adapted Flesch + reference depth + verb distance. Flags hard-to-read government letters, terms & conditions, abstracts.
+
+## How to use
+
+```yaml
+steps:
+  - id: step
+    use: text.readability_score@^0
+    with:
+      # see inputs in module.yaml
+```
+
+## License
+
+Apache-2.0 — part of the Recl∆Im module set (Flemming.AI), built on Ch∆In.