Add Makefile

Makefile

+# Makefile for MPI program
+
+# Source file
+SRC = hello_world.c
+
+# number of process
+NP = 2
+
+# Compiler
+CC = mpicc
+
+# Executable name
+EXE = ./out
+
+all: $(EXE) 
+
+$(EXE): $(SRC)
+	$(CC) -o $(EXE) $(SRC)
+
+clean:
+	rm -f $(EXE)
+
+run:
+	mpirun -np $(NP) -f mpi_hosts $(EXE) 
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README.md

@@ -43,6 +43,8 @@ Or specify the same in a hostfile (add user=mpiuser for slave1, slave2 hosts)
 mpirun -np 3 -f mpi_hosts ./mpi_sampl
 ```
 
+Use Makefile
+To compile the program type "make" which compiles the program with "mpicc".
 
 *Useful Links*
 * [MPI Tutorial](https://mpitutorial.com/tutorials/)
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