Add README and fix CMakeLists.txt for in tree build

CMakeLists.txt

@@ -12,7 +12,7 @@ foreach( LANG ${LANG_ARRAY} )
                      ${CMAKE_SOURCE_DIR}/${LANG}/kicad.po
                      -o ${CMAKE_BINARY_DIR}/${LANG}/kicad.mo )
 
-    install( DIRECTORY ${CMAKE_BINARY_DIR}/${LANG}
+    install( FILES ${CMAKE_BINARY_DIR}/${LANG}/kicad.mo
              DESTINATION share/kicad/internat
              COMPONENT resources )
 endforeach()

README

@@ -0,0 +1,23 @@
+= KiCad GUI translations
+
+This is the repository for the po files that is used for the GUI
+translations for KiCad.
+
+It is cmake equipped to conform with the rest of the installation
+principles for KiCad.
+
+== Depends
+- Cmake
+- Gettext
+
+== How to install
+```
+cd kicad-i18n
+cmake .
+make
+make install
+```
+
+If you want to change the default install prefix to match your KiCad
+build, you can add for
+example use `-DCMAKE_INSTALL_PREFIX=/usr`.