Add a legal disclaimer view

src/RootViewModel.js

@@ -29,6 +29,7 @@ export class RootViewModel extends ViewModel {
         this.openLinkViewModel = null;
         this.createLinkViewModel = null;
         this.loadServerPolicyViewModel = null;
+        this.showDisclaimer = false;
         this.preferences.on("canClear", () => {
             this.emitChange();
         });
@@ -50,11 +51,23 @@ export class RootViewModel extends ViewModel {
         this.emitChange();
     }
 
+    _showDisclaimer() {
+        this.showDisclaimer = true;
+        this.link = null;
+        this.openLinkViewModel = null;
+        this.createLinkViewModel = null;
+        this.loadServerPolicyViewModel = null;
+        this.emitChange();
+    }
+
     updateHash(hash) {
+        this.showDisclaimer = false;
         if (hash.startsWith("#/policy/")) {
             const server = hash.substr(9);
             this.loadServerPolicyViewModel = new LoadServerPolicyViewModel(this.childOptions({server}));
             this.loadServerPolicyViewModel.load();
+        } else if (hash.startsWith("#/disclaimer/")) {
+            this._showDisclaimer();
         } else {
             const oldLink = this.link;
             this.link = Link.parse(hash);