added a .gitignore

.gitignore

+# Operating system files
+.DS_Store
+Thumbs.db
+
+# node_modules becomes very big after npm install
+src/frontend/node_modules
+
+# after npm start
+.angular/
\ No newline at end of file

src/frontend/package.json

@@ -65,6 +65,7 @@
     "@perfectmemory/ngx-contextmenu": "^16.0.2",
     "class-transformer": "^0.5.1",
     "copy-webpack-plugin": "^11.0.0",
+    "Cortado": "file:",
     "d3": "~7.9.0",
     "electron-store": "^8.2.0",
     "gumshoejs": "^5.1.2",
@@ -76,8 +77,8 @@
     "ngx-clipboard": "^16.0.0",
     "ngx-color-picker": "^16.0.0",
     "ngx-file-drop": "^16.0.0",
-    "ngx-slider-v2": "^16.0.2",
     "ngx-markdown": "^16.0.0",
+    "ngx-slider-v2": "^16.0.2",
     "object-hash": "^2.2.0",
     "portfinder": "^1.0.32",
     "reflect-metadata": "^0.1.14",