Update usecase-db.md

docs/research/usecase-db.md

@@ -1,5 +1,20 @@
 # Privacy Use-Cases DB
 
-Ideas & references for privacy builders.
+Ideas & references for privacy builders
 
-* https://github.com/Msiusko/web3privacy/blob/main/Use-cases.md
+**idea**: create comprehensive privacy x web3 use-cases DB
+
+**Purpose**:
+- help devs to build meaningful services
+- avoid duplications within hackathons
+- improve existing use-cases
+- expand horizon beyond transactional privacy
+
+### Current stage
+- Initial DB concept aggregated
+- DB restructuring should be made (add more practical links)
+- Expand use-cases database
+
+### Phase 1: initial DB aggregaton 23'
+
+[DB](https://github.com/Msiusko/web3privacy/blob/main/Use-cases.md)