added json.html.markdown

Very short and slightly silly, but I think it works.

json.html.markdown

@@ -0,0 +1,49 @@
+---
+language: json
+filename: learnjson.json
+contributors:
+  - ["Anna Harren", "https://github.com/iirelu"]
+---
+
+                                                                                0
+As JSON is an extremely simple data-interchange format, this is most likely going
+to be the simplest Learn X in Y Minutes ever.
+
+JSON in its purest form has no actual comments, but most parsers will accept
+C-style (//, /\* \*/) comments. For the purposes of this, everything is going to
+be 100% valid JSON. Luckily, it kind of speaks for itself.
+
+```json
+{
+  "numbers": 0,
+  "strings": "Hellø, wørld. All unicode is allowed.",
+  "has bools?": true,
+  "nothingness": null,
+
+  "big number": 1.2e+100,
+
+  "objects": {
+    "comment": "Most of your structure will come from objects.",
+
+    "array": [0, 1, 2, 3, "banana", 5],
+
+    "another object": {
+      "comment": "These things can be nested, very useful."
+    }
+  },
+
+  "silliness": [
+    {
+      "sources of potassium": ["bananas"]
+    },
+    [
+      [1, 0, 0, 0],
+      [0, 1, 0, 0],
+      [0, 0, 1, "neo"],
+      [0, 0, 0, 1]
+    ]
+  ],
+
+  "that was short": "And, you're done. You know know everything JSON has to offer."
+}
+```