Fix Typo; Update Readme with Build Intructions;

CMakeLists.txt

@@ -6,7 +6,7 @@ if(MSVC)
     add_definitions(-D_USE_MATH_DEFINES)
 endif()
 
-#use cmake option -DNOTONES=OFF to disable AMBE+2 Tones
+#use cmake option -DNOTONES=ON to disable AMBE+2 Tones
 option(NOTONES
     "Disable AMBE+2 Tones" OFF)
 if (NOTONES)

README.md

@@ -9,10 +9,25 @@ Readers are strongly advised to check for any patent restrictions
 or licencing requirements before compiling or using this source code.
 ```
 
-mbelib 1.3.3T
+mbelib 1.3.3T w/ AMBE+2 Tone Synthesis
 
 ```
 mbelib supports the 7200x4400 bit/s codec used in P25 Phase 1,
 the 7100x4400 bit/s codec used in ProVoice, AMBE used in DSTAR,
 and AMBE+2 used in DMR, NXDN, P25 Phase 2, dPMR, etc.
 ```
+
+Build Instructions
+
+```
+git clone https://github.com/lwvmobile/mbelib.git
+git checkout ambe_tones
+cd mbelib
+mkdir build
+cd build
+cmake ..
+make
+sudo make install
+```
+
+To Disable AMBE+2 Tones, run cmake with option `cmake -DNOTONES=ON ..` when building.