Add initial version of readme file. 📖

README.md

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+# Timer Controller
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+Timer Controller is a native system application to program the SRIKit timer modules. For the building and usage instructions, refer to the [documentation](https://github.com/srikit/timer-controller/wiki) provided in the [wiki](https://github.com/srikit/timer-controller/wiki).
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+Timer Controller is an open-source application. All the source code requires to build a Timer Controller are available in this repository. 
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+This application and its source code are distributed under the terms of [GNU General Public License version 3.0](https://github.com/srikit/timer-controller/blob/main/LICENSE).