Demo Mode (#117)

* Adding Demo Mode to Fredy

ui/src/services/rematch/models/demoMode.js

@@ -0,0 +1,24 @@
+import { xhrGet } from '../../xhr';
+export const demoMode = {
+  state: {
+    demoMode: false,
+  },
+  reducers: {
+    setDemoMode: (state, payload) => {
+      return {
+        ...state,
+        demoMode: payload.demoMode,
+      };
+    },
+  },
+  effects: {
+    async getDemoMode() {
+      try {
+        const response = await xhrGet('/api/demo');
+        this.setDemoMode(response.json);
+      } catch (Exception) {
+        console.error('Error while trying to get resource for api/demo. Error:', Exception);
+      }
+    },
+  },
+};