add keybindings doc

docs/Keybindings.md

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+# Keybindings:
+
+## Global:
+
+      ← → ↑ ↓:   navigate
+      PgUp/PgDn: scroll diff panel
+      q:         quit
+
+## Files Panel:
+
+      space:    toggle staged
+      c:        commit changes
+      shift+S:  stash files
+      o:        open (osx only)
+      s:        open in sublime (requires 'code' command)
+      v:        open in vscode (requires 'subl' command)
+      i:        add to .gitignore
+      d:        delete if untracked checkout if tracked (aka go away)
+      shift+R:  refresh files
+
+## Branches Panel:
+
+      space:    checkout branch
+      f:        force checkout branch
+      m:        merge into currently checked out branch
+      c:        checkout by name
+      n:        new branch
+
+## Commits Panel:
+
+      s:       squash down (only available for topmost commit)
+      r:       rename commit
+      g:       reset to this commit
+
+## Stash Panel:
+
+      space:   apply
+      k:       pop
+      d:       drop
+
+## Popup Panel:
+
+      esc:     close/cancel
+      enter:   confirm
+
+## Resolving Merge Conflicts (Diff Panel):
+
+      ← →:   navigate conflicts
+      ↑ ↓:   select hunk
+      space: pick hunk
+      b:     pick both hunks
+      z:     undo (only available while still inside diff panel)