[examples] rearrange examples to give big examples their own folder; add hand written files for type info example

examples/intro/hello_world.c

@@ -0,0 +1,26 @@
+/* 
+** Example: hello world
+*/
+
+//~ includes and globals //////////////////////////////////////////////////////
+
+#include "md.h"
+#include "md.c"
+
+static MD_Arena *arena = 0;
+
+//~ main //////////////////////////////////////////////////////////////////////
+
+int
+main(int argc, char **argv){
+    // setup the global arena
+    arena = MD_ArenaAlloc();
+    
+    // parse a string
+    MD_String8 name = MD_S8Lit("<name>");
+    MD_String8 hello_world = MD_S8Lit("hello world");
+    MD_ParseResult parse = MD_ParseWholeString(arena, name, hello_world);
+    
+    // print the results
+    MD_PrintDebugDumpFromNode(stdout, parse.node, MD_GenerateFlags_All);
+}