Add README [skip ci]

Author: will-v-pi

README.md

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+# Pico SDK Tools
+
+This repository is used to provide pre-built binaries of the SDK tools for Windows, MacOS, Raspberry Pi OS, and other Linux operating systems (builds performed on Ubuntu).
+These binaries are primarilly for use by the [pico-vscode](https://github.com/raspberrypi/pico-vscode) extension, and the release format is subject to change at any time.
+
+The tools currently included are
+* picotool
+* OpenOCD
+* pioasm
+* Risc-V Toolchain for Raspberry Pi OS - for other OSs, the extension uses the compilers from [Core-V](https://www.embecosm.com/resources/tool-chain-downloads/#corev)