Add build rule back for markupsafe.

The markupsafe lib wasn't in the master-without-vendor branch due to
there is merge conflict master -> master-without-vendor that has not
been resolved. But markupsafe is merged in master-without-vendor branch
now. ag/12545538. So add the build rule back.
For the details of merging conflict: b/167204216

Change-Id: Ice72543e236a23a14c458f0dff211db7f31d12f1
diff --git a/Android.bp b/Android.bp
new file mode 100644
index 0000000..9d3fe9f
--- /dev/null
+++ b/Android.bp
@@ -0,0 +1,16 @@
+python_library {
+    name: "py-markupsafe",
+    host_supported: true,
+    srcs: [
+        "src/markupsafe/__init__.py",
+        "src/markupsafe/_native.py",
+    ],
+    version: {
+        py2: {
+            enabled: true,
+        },
+        py3: {
+            enabled: true,
+        },
+    },
+}