Revamp rp examples

tutorials/rp/pico-rm2/README.md

@@ -0,0 +1,28 @@
+# RP2040 / RP2350 Mongoose example
+
+This example can be built for both RP2040 and RP2350 targets.
+
+## Set target board
+
+By default, it builds for RP2040 target. If you want to change the target
+board, edit `CMakeKists.txt` and set the board, for example:
+
+```cmake
+set(PICO_BOARD pico2_w)
+```
+
+## Edit WiFi credentials
+
+For WiFi examples, edit `wifi.c` and set WiFi network name and password.
+
+## Build and run
+
+Make sure you have `picotool` installed. Then run:
+
+```sh
+make build flash
+```
+
+Start serial console to see the debug output.
+
+See detailed documentation at https://mongoose.ws/docs/guides/rp-tcpip-stack/