Create war artifact

web.xml is restored from: Ib8f187039.  Ths commit partially reverts
f54665e0a0ec4025fa01d79911ff5ae4e88fc19f.

Test Plan:

  $ bazel build gitiles
  $ unzip -t bazel-bin/gitiles.war

Change-Id: I9778da62b06b357c718275837a3df95ca0043562

gitiles-war/src/main/resources/web.xml

diff --git a/gitiles-war/src/main/resources/web.xml b/gitiles-war/src/main/resources/web.xml
new file mode 100644
index 0000000..bffacb5
--- /dev/null
+++ b/gitiles-war/src/main/resources/web.xml
@@ -0,0 +1,40 @@
+<!DOCTYPE web-app PUBLIC
+ "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
+ "http://java.sun.com/dtd/web-app_2_3.dtd" >
+<!--
+  Copyright 2012 Google Inc. All Rights Reserved.
+
+  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.
+-->
+<web-app>
+  <display-name>Gitiles</display-name>
+
+  <servlet>
+    <servlet-name>gitiles</servlet-name>
+    <servlet-class>com.google.gitiles.GitilesServlet</servlet-class>
+    <init-param>
+      <param-name>configPath</param-name>
+      <param-value>gitiles.config</param-value>
+    </init-param>
+  </servlet>
+
+  <servlet-mapping>
+    <servlet-name>default</servlet-name>
+    <url-pattern>/+static/*</url-pattern>
+  </servlet-mapping>
+
+  <servlet-mapping>
+    <servlet-name>gitiles</servlet-name>
+    <url-pattern>/*</url-pattern>
+  </servlet-mapping>
+</web-app>