Migration to typescript: first step

Add vue cli typescript support
Rename .js to .ts
Use class and annotations in App and NavBar
Add tslint

js/src/graphql/user.ts

@@ -0,0 +1,28 @@
+import gql from 'graphql-tag';
+
+export const CREATE_USER = gql`
+mutation CreateUser($email: String!, $username: String!, $password: String!) {
+  createUser(email: $email, username: $username, password: $password) {
+    preferredUsername,
+    user {
+      email,
+      confirmationSentAt
+    }
+  }
+}
+`;
+
+export const VALIDATE_USER = gql`
+mutation ValidateUser($token: String!) {
+  validateUser(token: $token) {
+    token,
+    user {
+      id,
+    },
+    actor {
+      avatarUrl,
+      preferredUsername,
+    }
+  }
+}
+`;