first commit, configure cmake

src/CMakeLists.txt

@@ -0,0 +1,11 @@
+#add executable for main
+add_executable(emon main.cpp)
+
+# Pull in our pico_stdlib which aggregates commonly used features
+target_link_libraries(emon pico_stdlib)
+
+# create map/bin/hex/uf2 file etc.
+pico_add_extra_outputs(emon)
+
+# add url via pico_set_program_url
+example_auto_set_url(emon)