Initial data commit

Task/Arithmetic-Complex/Sidef/arithmetic-complex.sidef

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+var a = 1:1                 # Complex(1, 1)
+var b = 3.14159:1.25        # Complex(3.14159, 1.25)
+
+[   a + b,                  # addition
+    a * b,                  # multiplication
+    -a,                     # negation
+    a.inv,                  # multiplicative inverse
+    a.conj,                 # complex conjugate
+    a.abs,                  # abs
+    a.sqrt,                 # sqrt
+    b.re,                   # real
+    b.im,                   # imaginary
+].each { |c| say c }