hgweb: add .jshintrc with some basic rules

This file is picked up automatically by jshint, so no extra changes required in
test-check-jshint.t.

.jshintrc

@@ -0,0 +1,11 b''
+{
+    // Enforcing
+    "eqeqeq"        : true,     // true: Require triple equals (===) for comparison
+    "forin"         : true,     // true: Require filtering for..in loops with obj.hasOwnProperty()
+    "freeze"        : true,     // true: prohibits overwriting prototypes of native objects such as Array, Date etc.
+    "nonbsp"        : true,     // true: Prohibit "non-breaking whitespace" characters.
+    "undef"         : true,     // true: Require all non-global variables to be declared (prevents global leaks)
+
+    // Environments
+    "browser"       : true      // Web Browser (window, document, etc)
+}

tests/test-check-code.t

@@ -44,6 +44,7 b' Prevent adding new files in the root dir'
   .hgignore
   .hgsigs
   .hgtags
+  .jshintrc
   CONTRIBUTING
   CONTRIBUTORS
   COPYING