Adding new PlatypusTS todo app.

PlatypusTS is an MVVM framework focused on assisting with writing scalable cross-platform applications. The framework is written in TypeScript in order to take advantage of features such as static typing, enhanced tooling, and future ES compatibility. It is possible to write a vanilla JS app using PlatypusTS, but the recommended approach is to embrace TypeScript. PlatypusTS follows the "POJO" model methodology, supports two-way databinding, DI, and is built with modularity/testability in mind.

Included are unit tests in the tests directory. There is also a tests.md which shows the output of the mocha, grunt, and karma tests.

## Highlights
* Extensible by building custom components/controls
* Uses TypeScript for scalability
* Works with AMD/CommonJS loaders
* Excellent developer experience.
* Built with unit testing in mind, eliminates a lot of need for direct DOM manipulation.

## About this Pull Request
* [x] Complete to TodoMVC spec
* [x] Follows TodoMVC code style guide
* [x] JSHint passes
* [x] Browser tests pass (mocha/grunt, 28/28)
* [x] Unit test (using Karma/Jasmine) 100% coverage
* [x] Readme
* [x] Tests containing all test output

website: http://getplatypi.com