add rich-json.pegjs and an example

Author: thzt

.gitignore

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+node_modules/
+npm-debug.log

README.md

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 # rich-json-parser
 Support regular expression to be a JSON value.
+
+Using [PEG.js](), the parser will not return an AST, but a javascript object.
+
+For example: 
+
+```
+{
+    "a": 1,
+    "b": [2, "3", /^\d+$/],
+    "c": /x(.+?)y/g
+}
+```
+
+or 
+
+```
+{ "a": 1, "b": [2, "3", /^\d+$/], "c": /a(.+?)y/g }
+```
+
+We will get the a javascript object as the result, 
+
+```
+const result = {
+    "a": 1,
+    "b": [2, "3", /^\d+$/],
+    "c": /x(.+?)y/g
+};
+```

examples/index.js

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+const fs = require('fs');
+const path = require('path');
+const peg = require('pegjs');
+
+const grammarFile = path.resolve('../rich-json.pegjs');
+const richJsonGrammar = fs.readFileSync(grammarFile, 'utf-8');
+
+const richJsonParser = peg.generate(richJsonGrammar);
+
+const json = `{
+    "a": 1,
+    "b": [2, "3", /^\d+$/],
+    "c": /x(.+?)y/g
+}`;
+const result = richJsonParser.parse(json);
+
+console.log(result);

package.json

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+{
+  "name": "rich-json-parser",
+  "version": "1.0.0",
+  "description": "Support regular expression to be a JSON value.",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/thzt/rich-json-parser.git"
+  },
+  "keywords": [
+    "json",
+    "regular expression",
+    "pegjs"
+  ],
+  "author": "thzt",
+  "license": "ISC",
+  "bugs": {
+    "url": "https://github.com/thzt/rich-json-parser/issues"
+  },
+  "homepage": "https://github.com/thzt/rich-json-parser#readme",
+  "dependencies": {
+    "pegjs": "^0.10.0"
+  }
+}