Add support for building with meson

fixes #44

source/ddbus/meson.build

@@ -0,0 +1,33 @@
+lib_src = [
+    'attributes.d',
+    'bus.d',
+    'c_lib.d',
+    'conv.d',
+    'exception.d',
+    'package.d',
+    'router.d',
+    'simple.d',
+    'thin.d',
+    'util.d',
+]
+
+ddbus_lib = library(
+    'ddbus',
+    lib_src,
+    version: meson.project_version(),
+    install: true,
+    include_directories: src_inc,
+)
+
+pkgc = import('pkgconfig')
+
+pkgc.generate(
+    ddbus_lib,
+    subdirs: 'd/ddbus',
+    requires: dbus_dep,
+)
+
+install_headers(
+    lib_src,
+    subdir: 'd/ddbus/ddbus',
+)