Check username and password strength

Changes:
- Check username availability
- Measure password strength

GitLab: #12
Change-Id: Ia384aaec01186cc874ddd6dfb4997da91a333a66
diff --git a/client/package.json b/client/package.json
index 6eb5ca7..3bfa307 100644
--- a/client/package.json
+++ b/client/package.json
@@ -40,6 +40,7 @@
     "@testing-library/user-event": "^14.4.3",
     "@types/jest": "^28.1.8",
     "axios": "^0.27.2",
+    "check-password-strength": "^2.0.7",
     "dayjs": "^1.11.5",
     "emoji-picker-react": "^3.6.1",
     "framer-motion": "^7.3.5",