Initial data commit

Task/Array-concatenation/Mathcad/array-concatenation.mathcad

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+create a pair of arbitrary array:
+    a:=matrix(2,2,max) b:=a+3
+
+    a=|0 1|   b=|3 4|
+      |1 1|     |4 4|
+
+concatentate them vertically:
+                 |0 1|
+    stack(a,b) = |1 1|
+                 |3 4|
+                 |4 4|
+
+    augment(a,b) = |0 1 3 4|
+                   |1 1 3 4|