add readme, clean up wrong filenames

main.cpp

@@ -1,16 +0,0 @@
-#include <hardware/adc.h>
-#include <pico/stdlib.h>
-#include <pico/time.h>
-#include <print>
-
-int main() {
-    stdio_init_all();
-    adc_init();
-    adc_gpio_init(26);
-    adc_select_input(0);
-    while (1) {
-        const float conv_factor = 3.3f / (1 << 12);
-        std::println("ldsakjf");
-        sleep_ms(500);
-    }
-}