build: Provide initial meson infrastructure

Define the starting points for the libcamera build using
meson and ninja build components.

An initial 'dummy' library class is created, and a test binary links
against the shared library calling it's init_lib() function.

Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

lib/main.cpp

@@ -0,0 +1,13 @@
+#include <iostream>
+
+namespace libcamera {
+
+using std::cout;
+using std::endl;
+
+void init_lib(void)
+{
+	cout << "Lib Camera Init" << endl;
+}
+
+};