tests: add dir and meson option

Add tests dir and meson option to enable tests.

Tested: meson build passed.

Change-Id: I8fce7227664e3ae9d41d25a8d22196baad59ed20
Signed-off-by: Jagpal Singh Gill <paligill@gmail.com>
diff --git a/tests/meson.build b/tests/meson.build
new file mode 100644
index 0000000..8b13789
--- /dev/null
+++ b/tests/meson.build
@@ -0,0 +1 @@
+