Add link to mojo/src/url

Change-Id: I7e6394f78d18ed8fb5972fd426f4e1a1bc8c5943
diff --git a/url b/url
new file mode 120000
index 0000000..8552bfb
--- /dev/null
+++ b/url
@@ -0,0 +1 @@
+../src/url
\ No newline at end of file