Update README and CMakeLists

Expanded Installing section of README
CMAKE_BUILD_TYPE defaults to Release if unset
Runtime data is installed under share/sickle/ directory instead of
directly into share/

Author: treecase

CMakeLists.txt

@@ -26,6 +26,12 @@ project("Sickle Editor"
     LANGUAGES CXX
 )
 
+if(CMAKE_BUILD_TYPE STREQUAL "")
+    message("CMAKE_BUILD_TYPE is unset, defaulting to Release")
+    set(CMAKE_BUILD_TYPE Release)
+endif()
+
+
 # Application ID
 set(APPLICATION_ID com.github.treecase.sicklegtk)
 # GResource prefix
@@ -103,7 +109,7 @@ target_link_libraries(sickle PRIVATE
 
 
 install(TARGETS sickle)
-install(DIRECTORY lua-runtime TYPE DATA)
+install(DIRECTORY sickle TYPE DATA)
 install(FILES "${CMAKE_CURRENT_BINARY_DIR}/${APPLICATION_ID}.desktop"
     DESTINATION share/applications
 )
@@ -112,7 +118,7 @@ if(WIN32)
         DESTINATION share/glib-2.0/schemas
     )
 else()
-    install(FILES sicklegtk.gschema.xml
+    install(FILES "${CMAKE_CURRENT_BINARY_DIR}/sicklegtk.gschema.xml"
         DESTINATION share/glib-2.0/schemas
         RENAME ${APPLICATION_ID}.gschema.xml
     )

README.md

@@ -50,12 +50,16 @@ FL_LIBRARY:FILEPATH=C:/msys64/usr/lib/libfl.a
 
 ## Installing
 
+To install to `/usr/local`, run:
+
 ```shell
 $ cmake --install .
+# To install somewhere else:
+$ cmake --install . --prefix=<install prefix>
 ```
 
-or,
+On Linux, you'll also have to install the settings schema:
 
 ```shell
-$ cmake --install . --prefix=<install path>
+$ glib-compile-schemas <install prefix>/share/glib-2.0/schemas
 ```