Update README.md

Author: nuket

README.md

@@ -26,6 +26,8 @@ isr_stack ( start: 20007800 end: 20008000 size: 00000800 used: 000002B0 )
 
 ## Use
 
+Add to your program:
+
 ```
 mbed add https://github.com/nuket/mbed-memory-status.git mbed-memory-status
 ```
@@ -49,3 +51,4 @@ Then define this in `mbed_memory_status.c`, or via the `mbed_app.json` macros, o
 
 This code exists because of a stupid amount of bug-hunting:
 > https://vilimpoc.org/blog/2017/02/01/stack-heap-and-thread-crash-hunting-in-mbed-os/
+> https://vilimpoc.org/blog/2017/02/04/isr-stack-usage-on-mbed/