Moved hello.c example to its own dir

examples/hello_world/Makefile

@@ -0,0 +1,19 @@
+# Copyright (c) 2014 Cesanta Software
+# All rights reserved
+
+PROG = hello_world
+CFLAGS = -W -Wall -I../.. $(CFLAGS_EXTRA)
+SOURCES = $(PROG).c ../../mongoose.c
+
+all: $(PROG)
+	./$(PROG)
+
+$(PROG): $(SOURCES) Makefile
+	$(CC) -o $(PROG) $(SOURCES) $(CFLAGS)
+
+win:
+	wine cl $(SOURCES) /MD /nologo /DNDEBUG /O1 /I../.. /Fe$(PROG).exe
+	wine $(PROG).exe
+
+clean:
+	rm -rf $(PROG) *.exe *.dSYM *.obj *.exp .*o *.lib *.gc*