Created Requirments (markdown)

Requirments.md

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+# Requirements
+- Android 7.0 (API 24) or higher
+  - Application could also be used with your Android network radio, such as Inrico TM-7, apk just needs to be installed over USB, see [Discussion](https://github.com/sh123/codec2_talkie/issues/4)
+- Android 5.0, 5.1, 6.0 (API 21, 22, 23)
+  - Separate apk package is released with "legacy" suffix from legacy branch
+- Modem, radio module or transceiver which supports [KISS protocol](https://en.wikipedia.org/wiki/KISS_(TNC)) or can process KISS or raw Codec2 audio frames over serial Bluetooth, USB or TCP/IP