picotool: add page (#15712)

Co-authored-by: Wiktor Perskawiec <git@spageektti.cc>
Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>

pages/common/picotool.md

@@ -0,0 +1,32 @@
+# picotool
+
+> Manage Raspberry Pi Pico boards.
+> More information: <https://github.com/raspberrypi/picotool>.
+
+- Display information about the currently loaded program on a Pico:
+
+`picotool info`
+
+- Load a binary onto a Pico:
+
+`picotool load {{path/to/binary}}`
+
+- Convert an ELF or BIN file to UF2:
+
+`picotool uf2 convert {{path/to/elf_or_bin}} {{path/to/output}}`
+
+- Reboot a Pico:
+
+`picotool reboot`
+
+- List all known registers:
+
+`picotool otp list`
+
+- Display version:
+
+`picotool version`
+
+- Display help:
+
+`picotool help`