Add meson build

This commit is to add meson build.
and later, we will remove Autotools and replace it with meson build.

Tested: built openpower-occ-control successfully and Unit test passes.

Signed-off-by: George Liu <liuxiwei@inspur.com>
Change-Id: I7f5fbc7150194a78f9b36bb256613fc70b834130
diff --git a/gen/meson.build b/gen/meson.build
new file mode 100644
index 0000000..56193c7
--- /dev/null
+++ b/gen/meson.build
@@ -0,0 +1,14 @@
+# Generated file; do not modify.
+sdbuspp_gen_meson_ver = run_command(
+    sdbuspp_gen_meson_prog,
+    '--version',
+).stdout().strip().split('\n')[0]
+
+if sdbuspp_gen_meson_ver != 'sdbus++-gen-meson version 3'
+    warning('Generated meson files from wrong version of sdbus++-gen-meson.')
+    warning(
+        'Expected "sdbus++-gen-meson version 3", got:',
+        sdbuspp_gen_meson_ver
+    )
+endif
+