Add start of Rhombus syntax, comments and highlighting (#136)

Author: TimWhiting

language-configuration-rhombus.json

@@ -0,0 +1,51 @@
+{
+  "comments": {
+    "lineComment": "//",
+    "blockComment": ["/*", "*/"]
+  },
+  "brackets": [
+    ["{", "}"],
+    ["[", "]"],
+    ["(", ")"]
+  ],
+  "autoClosingPairs": [
+    {
+      "open": "{",
+      "close": "}"
+    },
+    {
+      "open": "[",
+      "close": "]"
+    },
+    {
+      "open": "(",
+      "close": ")"
+    },
+    {
+      "open": "\"",
+      "close": "\"",
+      "notIn": ["string"]
+    },
+    {
+      "open": "'",
+      "close": "'",
+      "notIn": ["string"]
+    },
+    {
+      "open": "/*",
+      "close": "*/",
+      "notIn": ["string"]
+    }
+  ],
+  "autoCloseBefore": ")]},'`;| \n\t#",
+  "surroundingPairs": [
+    ["{", "}"],
+    ["[", "]"],
+    ["(", ")"],
+    ["\"", "\""],
+    ["/*", "*/"],
+    ["'", "'"]
+  ],
+  "wordPattern": "(?<=(\\p{Z}|^))([\\p{L}_\\p{S}][\\p{L}\\p{N}\\p{Pc}\\p{S}]*)(?=(\\p{Z}|$))",
+  "folding": { "offSide": true }
+}