Add meson build

meson.build

@@ -0,0 +1,43 @@
+project('gsr-overlay', ['cpp'], version : '1.0.0', default_options : ['warning_level=2', 'cpp_std=c++17'], subproject_dir : 'depends')
+
+if get_option('buildtype') == 'debug'
+    add_project_arguments('-g3', language : ['cpp'])
+elif get_option('buildtype') == 'release'
+    add_project_arguments('-DNDEBUG', language : ['cpp'])
+endif
+
+src = [
+    'src/Theme.cpp',
+    'src/gui/ScrollablePage.cpp',
+    'src/gui/Button.cpp',
+    'src/gui/Entry.cpp',
+    'src/gui/ComboBox.cpp',
+    'src/gui/Page.cpp',
+    'src/gui/StaticPage.cpp',
+    'src/gui/Widget.cpp',
+    'src/gui/List.cpp',
+    'src/gui/Utils.cpp',
+    'src/gui/DropdownButton.cpp',
+    'src/gui/Label.cpp',
+    'src/GsrInfo.cpp',
+    'src/Process.cpp',
+    'src/main.cpp',
+]
+
+mglpp_proj = subproject('mglpp')
+mglpp_dep = mglpp_proj.get_variable('mglpp_dep')
+
+dep = [
+    mglpp_dep,
+]
+
+executable(
+    meson.project_name(),
+    src,
+    install : true,
+    dependencies : dep,
+)
+
+prefix = get_option('prefix')
+datadir = get_option('datadir')
+install_subdir('images', install_dir : join_paths(prefix, datadir, 'gsr-overlay'))