build(root): added initial meson build system implimentation and mk script

we will use meson as the build system for this project. Added a rough outline of this which builds source, libraries, and links them to tests (along with the google test library for testing). meson will be setup and compiled with ./mk.

src/meson.build

@@ -0,0 +1,18 @@
+# Define the library
+dobj_sources = files(
+  'dobj/private/Metadata.cpp'
+)
+
+dobj_headers = files(
+  'dobj/public/Metadata.h'
+)
+
+# Define the libdobj library so it can be linked against by other parts of the build system
+libdobj = library('dobj',
+    dobj_sources, 
+    include_directories: include_directories('dobj/public'),
+    cpp_args: ['-fvisibility=default'],
+    install : true)
+
+# Make headers accessible
+install_headers(dobj_headers, subdir : '4DSSE/dobj')