adding uf2 file for micropython

resources/README.md

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+Included here is the UF2 file necessary to flash a Raspberry Pi Pico W with MicroPython.
+
+To use it:
+* Unplug your RPI from USB
+* Hold down the Bootsel button
+* While holding down, connect USB
+* Release Bootsel button
+
+The Pico will appear as a drive on your system.
+Drag and drop the UF2 file onto the Pico drive - it will be reset with MicroPython installed.
+
+You are ready to code!