feat(tmux:plugin): add plugin tmux-resurrect and tmux-continuum

  ## what
  - add plugin `tmux-resurrect` and `tmux-continuum`
  - configure plugin
    - create tmux-resurrect session directory if it's not created
      - ~/.local/state/tmux/plugins/tmux-resurrect/
    - auto restore from the last session automatically
    - auto save interval every 5 minutes

  ## how
  - obtained from
    - https://itsfoss.gitlab.io/post/how-to-save-and-restore-tmux-environments-across-reboots-in-linux/
    - https://github.com/tmux-plugins/tmux-continuum
    - https://github.com/tmux-plugins/tmux-continuum

  ## why
  - makes it easy to save the session and restore them

  ## where
  - ./roles/tmux/files/tmux.conf

  ## usage
  - Save session: prefix + Ctrl+s
  - Restore session: prefix + Ctrl+r

  ## commit id, issue or pull request

  ## notes

Author: Clumsy-Coder

roles/tmux/files/tmux.conf

@@ -67,3 +67,30 @@ set -g @plugin 'jaclu/tmux-menus'
 # <prefix> + u    list all urls in bottom pane
 set -g @plugin 'tmux-plugins/tmux-urlview'
 
+# ############################################################################################### #
+# auto save and restore tmux sessions
+# obtained from
+#   - https://itsfoss.gitlab.io/post/how-to-save-and-restore-tmux-environments-across-reboots-in-linux/
+#   - https://github.com/tmux-plugins/tmux-continuum
+#   - https://github.com/tmux-plugins/tmux-continuum
+set -g @plugin 'tmux-plugins/tmux-resurrect'
+set -g @plugin 'tmux-plugins/tmux-continuum'
+
+# tmux-resurrect
+# keybinding
+# Save session: prefix + Ctrl+s
+# Restore session: prefix + Ctrl+r
+
+# create directory to store tmux session details
+if "test ! -d $XDG_STATE_HOME/tmux/plugins/tmux-resurrect" \
+  "run 'mkdir -p $XDG_STATE_HOME/tmux/plugins/tmux-resurrect'"
+set -g @resurrect-save-dir "$XDG_STATE_HOME/tmux/plugins/tmux-resurrect" # or a different path
+set -g @resurrect-dir "$XDG_STATE_HOME/tmux/plugins/tmux-resurrect"
+
+# tmux-continuum: auto restore tmux-resurrect sessions
+set -g @continuum-boot 'on'
+set -g @continuum-restore 'on'
+
+set -g @continuum-save-interval '5' # Save every 5 minutes
+
+# ############################################################################################### #