add CPM.cmake instructions to readme

TheLartians · TheLartians · commit 02d6b45a8413 · 2020-06-08T18:12:25.000+02:00
diff --git a/CMakeLists.txt b/CMakeLists.txt
@@ -17,6 +17,7 @@ endif()
 include(${CPM_DOWNLOAD_LOCATION})
 
 # ---- Add dependencies via CPM ----
+# See https://github.com/TheLartians/CPM.cmake for details and examples
 
 CPMAddPackage(
   NAME Greeter
