adding python src and renamin _ext

src/creader_module.c

@@ -70,7 +70,7 @@ static PyMethodDef creader_methods[] = {
 // Module defenition
 static struct PyModuleDef creader_def = {
     PyModuleDef_HEAD_INIT,
-    "creader",
+    "_creader",
     module_docstring,
     -1,
     creader_methods, // m_methods
@@ -81,7 +81,7 @@ static struct PyModuleDef creader_def = {
 };
 
 // Initialize module and add classes
-PyMODINIT_FUNC PyInit_creader(void) {
+PyMODINIT_FUNC PyInit__creader(void) {
 
     PyObject *m = PyModule_Create(&creader_def);
     if (m == NULL)