Updated PARALLEL.md

Author: ByronEncinas

PARALLEL.md

@@ -1,3 +1,14 @@
 # How to multiprocess in Fortran
 
 - To be fair, I haven't done it yet. But I want to make sure OOP_F90 is scalable
+
+# OpenMP 
+
+- https://hpc-tutorials.llnl.gov/openmp/fortran_directive_format/#fixed-form-source
+- https://www.openmp.org/wp-content/uploads/F95_OpenMPv1_v2.pdf
+
+# Coarray (CAF)
+
+- https://en.wikipedia.org/wiki/Coarray_Fortran
+
+# MPI