add src/version.h with macros: MORM_VERSION_MAJOR, MORM_VERSION_MINOR, MORM_VERSION_PATCH

Let the version be 0.7.0.

src/morm.h

@@ -36,6 +36,7 @@
 #define headerfile_morm_morm
 
 
+#include "version.h"
 #include "morm_types.h"
 #include "model.h"
 #include "finder.h"
@@ -52,6 +53,7 @@
 #include "transaction.h"
 
 
+
 namespace morm
 {
 } // namespace