added bash completions

completion/available/hosts.completion.bash

@@ -0,0 +1,15 @@
+#!/usr/bin/bash
+
+if command -v hosts > /dev/null; then
+    __hosts_completions()  {
+        local OPTS=("add list remove")
+        COMPREPLY=()
+        for _opt_ in ${OPTS[@]}; do
+            if [[ "$_opt_" == "$2"* ]]; then
+                COMPREPLY+=("$_opt_")
+            fi
+        done
+    }
+    
+    complete -F __hosts_completions
+fi