Added README

README.md

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+# Welcome to Hell.
+
+## Installation instructions
+
+No need to clone this repo manually. You'll just need to install the Rust toolchain.
+
+```
+# All OSes
+cargo install --git https://git.zumepro.cz/michal.prochazka/tulflash
+```
+
+## Flashing Intel HEX binaries
+
+```
+# Linux
+tulflash --port /dev/ttyUSBx write <path-to-hex>
+
+# macOS
+tulflash --port /dev/tty.usbserial-xxx write <path-to-hex>
+
+# Wokňous
+tulflash --port COMx write <path-to-hex>
+```
+
+If the flash fails, try to add `--slow` before the `--port` argument (should not be needed though).
+
+The tool also allows reading and erasing the chip, figure that out on your own if you need that (although `tulflash --help` might guide you if you ask it nicely).
+