add the frozen JSON parser vmod

R1/source/vmods/vmod_frozen.json

+{
+    "date": "2018-08-28",
+    "desc": "Efficient JSON parsing based on the frozen parser",
+    "license": "FreeBSD",
+    "maintainer": "varnish-support@uplex.de",
+    "name": "frozen",
+    "repos": "https://code.uplex.de/uplex-varnish/libvmod-frozen",
+    "rev": {
+        "master": {
+            "url_vcc": "https://code.uplex.de/uplex-varnish/libvmod-frozen/raw/master/src/vmod_frozen.vcc",
+            "url_doc": "https://code.uplex.de/uplex-varnish/libvmod-frozen/blob/master/README.rst"
+        }
+    },
+    "status": "development",
+    "support": [
+        "Uplex"
+    ]
+}