cowsay: add page

pages/common/cowsay.md

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+# cowsay
+
+> Generate an ASCII character like a cow or sheep saying or thinking something
+
+- Print an ASCII cow saying "Hello world!"
+
+`cowsay "Hello world!"`
+
+- Print an ASCII dragon saying "Hello!"
+
+`echo "Hello!" | cowsay -f dragon`
+
+- Print a stoned thinking ASCII cow
+
+`cowthink -s "I'm just a cow, not a great thinker ..."`