list examples in readme; ignore .hex

.gitignore

@@ -32,6 +32,9 @@
 *.out
 *.app
 
+# Hex files
+*.hex
+
 # ---> Vim
 # Swap
 [._]*.s[a-v][a-z]

README.md

@@ -1,3 +1,10 @@
 # nucleo-l476rg-examples
 
-Code examples for the NUCLEO-L476RG development board
+Code examples for the NUCLEO-L476RG development board.
+
+**0.** Configure the processor to run at 80MHz using the phase-locked loop
+(PLL).
+
+**1.** ADC configuration and polled sampling. Set output LED according to a
+threshold.
+