Add Atom keymap file.

.atom/keymap.cson

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+# Your keymap
+#
+# Atom keymaps work similarly to style sheets. Just as style sheets use
+# selectors to apply styles to elements, Atom keymaps use selectors to associate
+# keystrokes with events in specific contexts. Unlike style sheets however,
+# each selector can only be declared once.
+#
+# You can create a new keybinding in this file by typing "key" and then hitting
+# tab.
+#
+# Here's an example taken from Atom's built-in keymap:
+#
+# 'atom-text-editor':
+#   'enter': 'editor:newline'
+#
+# 'atom-workspace':
+#   'ctrl-shift-p': 'core:move-up'
+#   'ctrl-p': 'core:move-down'
+#
+# You can find more information about keymaps in these guides:
+# * http://flight-manual.atom.io/using-atom/sections/basic-customization/#_customizing_keybindings
+# * http://flight-manual.atom.io/behind-atom/sections/keymaps-in-depth/
+#
+# If you're having trouble with your keybindings not working, try the
+# Keybinding Resolver: `Cmd+.` on macOS and `Ctrl+.` on other platforms. See the
+# Debugging Guide for more information:
+# * http://flight-manual.atom.io/hacking-atom/sections/debugging/#check-the-keybindings
+#
+# This file uses CoffeeScript Object Notation (CSON).
+# If you are unfamiliar with CSON, you can read more about it in the
+# Atom Flight Manual:
+# http://flight-manual.atom.io/using-atom/sections/basic-customization/#_cson
+
+'atom-text-editor':
+  'cmd-shift-d': 'git-plus:diff'
+
+'atom-workspace':  
+  'cmd-alt-o': 'project-manager:list-projects'