Update readme to include compiling instructions

	modified:   README.md

Author: bartobri

README.md

@@ -71,7 +71,7 @@ Usage
 
 **Synopsys**
 ```
-include "libnms.h"
+include "nms.h"
 
 int main(void) {
 
@@ -166,6 +166,14 @@ The nms_set_input_position() function is meant to be used in conjunction with
 the nms_set_return_opts() function. It sets the cursor position to the given x/y
 coordinates when nms_exec() requires a menu selection from the user.
 
+**Compiling**
+
+You must tell the compiler to include the nms library.
+
+```
+gcc myprogram.c -lnms
+```
+
 License
 -------