Add ag role for Debian, macOS, and Windows

roles/ag/tasks/Darwin.yaml

@@ -0,0 +1,5 @@
+---
+- name: install homebrew package
+  apt:
+    name: the_silver_searcher
+    state: latest

roles/ag/tasks/Debian.yaml

@@ -0,0 +1,6 @@
+---
+- name: install apt package
+  become: true
+  apt:
+    name: silversearcher-ag
+    state: latest

roles/ag/tasks/Windows.yaml

@@ -0,0 +1,5 @@
+---
+- name: install choco package
+  win_chocolatey:
+    name: ag
+    state: latest

roles/ag/tasks/main.yaml

@@ -0,0 +1,2 @@
+---
+- include_tasks: '{{ansible_os_family}}.yaml'