Hello world for Fortran.

src/hello/hello.for

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+C     Fortran hello world.
+C
+C Compile the source code with the F40 compiler:
+C *:dec sys:f40
+C *hello=hello.for
+C
+C Then load and link the relcatable file:
+C *:dec sys:loader
+C *hello/g
+C
+C Finally start DECUUO to dump an executable:
+C *45$g
+C Command: dump
+C *:pdump ts hello
+
+C       Unit 5 is the user teletype.
+        WRITE(5,10)
+10      FORMAT(12H HELLO WORLD)
+        STOP
+        END