cmake: add an installation target

...so that `make install` works.

Change-Id: I6f682be30b5cc5af74f2758219caead71e7b7234
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 62e4261..d2580c7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -119,3 +119,7 @@
         SOURCES ${doxyfile_in}
         )
 endif()
+
+install(TARGETS
+    netconf-cli
+    RUNTIME DESTINATION ${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_BINDIR}/)