Add cowsay functionality

src/cowsay.jl

@@ -1,5 +1,62 @@
 module cowsay
 
-# Write your package code here.
+export cowsay_function
+
+function cowsay_function(message::AbstractString)
+    messagelines = split(message, "\n")
+    nlines = length(messagelines)
+
+    linelength = max(length.(messagelines)...)
+    paddinglength = linelength + 2
+
+    if nlines == 1
+        balloon = string(
+            " ",
+            repeat("_", paddinglength),
+            "\n< ",
+            message,
+            " >\n ",
+            repeat("-", paddinglength),
+            "\n"
+        )
+    else
+        balloon = string(
+            " ",
+            repeat("_", paddinglength),
+            "\n/ ",
+            rpad(messagelines[1], linelength),
+            " \\\n"
+        )
+        if nlines > 2
+            for i=2:nlines-1
+                balloon = string(
+                    balloon,
+                    "| ",
+                    rpad(messagelines[i], linelength),
+                    " |\n"
+                )
+            end
+        end
+        balloon = string(
+            balloon,
+            "\\ ",
+            rpad(messagelines[end], linelength),
+            " /\n ",
+            repeat("-", paddinglength),
+            "\n"
+        )
+    end
+
+    cow = string(
+        "        \\   ^__^\n",
+        "         \\  (oo)\\_______\n",
+        "            (__)\\       )\\/\\\n",
+        "                ||----w |\n",
+        "                ||     ||"
+    )
+
+println(string(balloon, cow))
+end
+
 
 end