add README.md

README.md

+# InPlaceArrayTranspose
+
+This small program is a easy to read and understand implementation of the method introduced in
+
+F. G. Gustavson, T. Swirszcz. "In-Place Transposition of Rectangular Matrices". PARA, 4699 (2006): 560-569.
+
+See also
+
+M. F. Berman. "A Method for Transposing a Matrix". Journal of the ACM 5.4 (1958): 383-384.
+
+
+The implemented function `MIPT` uses cyclic shifting to transpose a row minor array in place.

main.f90

+! Program for transposing a rectengular (m x n) array with row minor storage.
 program main
 
   implicit none