Add cower cowfile tests

Signed-off-by: Thomas A. Christensen II <25492070+MillironX@users.noreply.github.com>

docs/src/cows.md

@@ -6,6 +6,7 @@ Examples of all the cowfiles available.
 
 ```@docs
 Cowsay.default
+Cowsay.cower
 ```
 
 ## Mascots

src/cows/cower.cow.jl

@@ -1,6 +1,30 @@
 ##
 ## A cowering cow
 ##
+"""
+    function cower()
+
+A cowering cow
+
+# Example
+
+```jldoctest
+julia> cowsay("Is it safe to come out yet?", cow=Cowsay.cower)
+ _____________________________
+< Is it safe to come out yet? >
+ -----------------------------
+     \\
+      \\
+        ,__, |    |
+        (oo)\\|    |___
+        (__)\\|    |   )\\_
+             |    |_w |  \\
+             |    |  ||   *
+
+             Cower....
+
+```
+"""
 function cower(;eyes="oo", tongue="  ", thoughts="\\")
 the_cow =
 """