Email cleanup: Add RegisterNewEmailHtml.soy

Currently, we support sending emails with HTML format for all
emails, except RegisterNewEmail. This change makes it allowed
for all emails. As a follow-up change, we will be able to remove
supportsHtml() since at that point it will always return true.

Change-Id: Ic1d71d2602b7888088b9d6057e2ed8545f35848f

resources/com/google/gerrit/server/mail/RegisterNewEmailHtml.soy

@@ -0,0 +1,48 @@
+/**
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+{namespace com.google.gerrit.server.mail.template}
+
+{template .RegisterNewEmailHtml}
+  {@param email: ?}
+  <p>
+    Welcome to Gerrit Code Review at {$email.gerritHost}.
+    To add a verified email address to your user account, please
+    click on the following link
+  </p>
+  {if $email.userNameEmail}
+    <p>
+        {sp}while signed in as {$email.userNameEmail}
+    </p>
+  {/if}:
+
+  <p>
+
+    {$email.gerritUrl}#/VE/{$email.emailRegistrationToken}
+  </p>
+  <p>
+    If you have received this mail in error, you do not need to take any
+    action to cancel the account.  The address will not be activated, and
+    you will not receive any further emails.
+  </p>
+  <p>
+    If clicking the link above does not work, copy and paste the URL in a
+    new browser window instead.
+
+    This is a send-only email address.  Replies to this message will not
+    be read or answered.
+  </p>
+{/template}