Add example which uses the in-built 'DMA sniff' capability to check a CRC32

dma/sniff_crc/CMakeLists.txt

@@ -0,0 +1,11 @@
+add_executable(sniff_crc
+        sniff_crc.c
+        )
+
+target_link_libraries(sniff_crc pico_stdlib hardware_dma)
+
+# create map/bin/hex file etc.
+pico_add_extra_outputs(sniff_crc)
+
+# add url via pico_set_program_url
+example_auto_set_url(sniff_crc)