Add TODO.md, LICENSE, CHANGELOG.md and version.json files

Author: hbakhtiyor

CHANGELOG.md

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+Copyright (c) 2013 Abd ar-Rahman Hamidi
+
+MIT License
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

MIT-LICENSE

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+*   Migrate from the dirty current schemas to [standard JSON schema](http://json-schema.org) 
+    by following [draft-04 specification](http://json-schema.org/draft-04/schema).
+
+*   Improve the current json-documents schemas by adding additional 
+    (`description`, `default`, `minItems`, `minimum`, `uniqueItems`, `required`, `items` and `enum`) properties.
+    For more information about this properties refer to the [link](http://json-schema.org/documentation.html). 
+
+    e.g.
+    ```json
+        {
+            "$schema": "http://json-schema.org/draft-04/schema#",
+            "title": "Product",
+            "description": "A product from Acme's catalog",
+            "type": "object",
+            "properties": {
+                "id": {
+                    "description": "The unique identifier for a product",
+                    "type": "integer"
+                },
+                "name": {
+                    "description": "Name of the product",
+                    "type": "string"
+                },
+                "price": {
+                    "type": "number",
+                    "minimum": 0,
+                    "exclusiveMinimum": true
+                },
+                "tags": {
+                    "type": "array",
+                    "items": {
+                        "type": "string"
+                    },
+                    "minItems": 1,
+                    "uniqueItems": true
+                }
+            },
+            "required": ["id", "name", "price"]
+        }
+    ```
+
+*   Add `ad` document's property for a negotiable, free, paid, etc ad's type.
+
+*   Add `placement_period` property to `ad` document for holding time period.
+    e.g. a day, a week, 2 weeks, a month, 2 months, ...
+
+*   Add sample data with utility test validation for the schemas.
+    For more information about the utility refer to the [link](http://json-schema.org/implementations.html)

TODO.md

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+{
+  "version": {
+    "major": 0,
+    "minor": 1,
+    "tiny": 0,
+    "pre": "alpha"
+  }
+}