Adds zsh completions script untouched.

.rc.d/zsh-completions.sh

@@ -0,0 +1,10 @@
+if type brew &>/dev/null; then
+    fpath=(  $(brew --prefix)/share/zsh-completions "${fpath[@]}" )
+fi
+
+# If you receive "zsh compinit: insecure directories" warnings when attempting
+# to load these completions, you may need to run these commands:
+#  chmod go-w '/opt/homebrew/share'
+#  chmod -R go-w '/opt/homebrew/share/zsh'
+
+# compinit will load and run after this in .zshrc