Initial data commit

Task/String-append/COBOL/string-append.cobol

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+      identification division.
+       program-id. string-append.
+
+       data division.
+       working-storage section.
+       01 some-string.
+          05 elements pic x occurs 0 to 80 times depending on limiter.
+       01 limiter     usage index value 7.
+       01 current     usage index.
+
+       procedure division.
+       append-main.
+
+       move "Hello, " to some-string
+
+      *> extend the limit and move using reference modification
+       set current to length of some-string
+       set limiter up by 5
+       move "world" to some-string(current + 1:)
+       display some-string
+
+       goback.
+       end program string-append.