add feature implementation

maths/add.rb

@@ -0,0 +1,20 @@
+# A ruby program to add numbers
+# Addition or sum of numbers means adding each and every element of the inputs
+# Sum or addition of 1 and 3 is 1 + 3 = 4
+
+def self_add(*array)
+  sum = 0
+  array.each { |a| sum+=a }
+  puts "The sum of following elements #{array} is #{sum}"
+  rescue
+    puts "Error: Please provide number only!"
+end
+
+# Valid inputs
+self_add(1)
+self_add(2, 5, -4)
+self_add(25, 45)
+
+# Invalid inputs
+self_add("1", 2, 3)
+self_add("a", 1)