[ecm] Add usage to fix printing error messages (#9210)

ports/ecm/CONTROL

@@ -1,4 +1,4 @@
 Source: ecm
-Version: 5.60.0-1
+Version: 5.60.0-2
 Homepage: https://github.com/KDE/extra-cmake-modules
 Description: Extra CMake Modules (ECM), extra modules and scripts for CMake

ports/ecm/portfile.cmake

@@ -1,6 +1,3 @@
-#cmake-only scripts
-include(vcpkg_common_functions)
-
 vcpkg_from_github(
     OUT_SOURCE_PATH SOURCE_PATH
     REPO KDE/extra-cmake-modules
@@ -12,10 +9,11 @@ vcpkg_from_github(
 vcpkg_configure_cmake(
     SOURCE_PATH ${SOURCE_PATH}
     PREFER_NINJA
-    OPTIONS -DBUILD_HTML_DOCS=OFF
-            -DBUILD_MAN_DOCS=OFF
-            -DBUILD_QTHELP_DOCS=OFF
-            -DBUILD_TESTING=OFF
+    OPTIONS
+        -DBUILD_HTML_DOCS=OFF
+        -DBUILD_MAN_DOCS=OFF
+        -DBUILD_QTHELP_DOCS=OFF
+        -DBUILD_TESTING=OFF
 )
 
 vcpkg_install_cmake()
@@ -23,9 +21,9 @@ vcpkg_install_cmake()
 # Remove debug files
 file(REMOVE_RECURSE ${CURRENT_PACKAGES_DIR}/debug)
 
+file(COPY ${CURRENT_PORT_DIR}/usage DESTINATION ${CURRENT_PACKAGES_DIR}/share/ecm)
 # Handle copyright
-file(COPY ${SOURCE_PATH}/COPYING-CMAKE-SCRIPTS DESTINATION ${CURRENT_PACKAGES_DIR}/share/ecm)
-file(RENAME ${CURRENT_PACKAGES_DIR}/share/ecm/COPYING-CMAKE-SCRIPTS ${CURRENT_PACKAGES_DIR}/share/ecm/copyright)
+file(INSTALL ${SOURCE_PATH}/COPYING-CMAKE-SCRIPTS DESTINATION ${CURRENT_PACKAGES_DIR}/share/${PORT} RENAME copyright)
 
 # Allow empty include directory
 set(VCPKG_POLICY_EMPTY_INCLUDE_FOLDER enabled)

ports/ecm/usage

@@ -0,0 +1,9 @@
+The package ecm provides CMake targets:
+
+    find_package(ECM CONFIG REQUIRED NO_MODULE)
+    set(CMAKE_MODULE_PATH ${ECM_MODULE_PATH})
+    include(KDEInstallDirs)
+    include(KDECompilerSettings)
+    include(KDECMakeSettings)
+
+For more infomation, see https://api.kde.org/ecm/