Import source to librtti

Summary:

- Import initial source

Test Plan:
NA

examples/meson.build

@@ -0,0 +1,18 @@
+#
+#app_c_srcs=[
+#  'app.c',
+#]
+#
+#app_srcs= app_c_srcs
+#
+#incdir = include_directories('../include', '.')
+#
+#app_deps = [
+#  dep_librtti,
+#]
+#
+#app = executable('app',
+#                 app_srcs,
+#                 include_directories: incdir,
+#                 dependencies: app_deps,
+#                 install: true)