Add meson files for basic Linux building

src/meson.build

@@ -0,0 +1,19 @@
+install_headers('raylib.h')
+
+source_c = [
+  'audio.c',
+  'core.c',
+  'models.c',
+  'rlgl.c',
+  'shapes.c',
+  'text.c',
+  'textures.c',
+  'utils.c',
+  'external/stb_vorbis.c',
+]
+
+raylib = shared_library('raylib',
+                        source_c,
+                        dependencies : [ glfw_dep, gl_dep, openal_dep, m_dep, x11_dep],
+                        install : true)
+