Add edraw-color-picker-mode.el

Add two minor modes, edraw-color-picker-mode and
edraw-color-picker-global-mode.

These minor modes allow you to use the color picker independently of
the drawing editor.

You can use the color picker in any buffer to replace or insert text
that represents a color.

README.org

@@ -244,37 +244,54 @@ The following code is an example of inserting an editor into a buffer from Emacs
 
 * Color Picker
 
-edraw-color-picker.el contains a color picker library and some commands.
+edraw-color-picker.el provides a color picker library and several commands.
 
-Commands to add/replace the selected color to the buffer:
-- edraw-color-picker-insert-color
+Commands to replace or insert the selected color in the buffer:
+
+- edraw-color-picker-replace-or-insert-color-at
 - edraw-color-picker-replace-color-at
-- edraw-color-picker-replace-or-insert-color-at-point
+- edraw-color-picker-insert-color-at
+
+edraw-color-picker-mode.el defines two minor modes, edraw-color-picker-mode and edraw-color-picker-global-mode, which make it easy to use these commands in any buffer.
+
+edraw-color-picker-mode adds key bindings for these commands in the buffer. You can customize the bindings flexibly with:
+
+  M-x customize-variable edraw-color-picker-mode-custom-bindings
+
+You can also bind specific keys for specific major modes. This mode also provides a context menu.
+
+edraw-color-picker-global-mode enables edraw-color-picker-mode in all buffers. If you want to enable it only for specific major modes, you can configure it with:
 
-Settings for using them while editing CSS or HTML:
+  M-x customize-variable edraw-color-picker-global-modes
+
+To use edraw-color-picker-global-mode, add the following to your init.el:
+
+#+begin_src elisp
+(require 'edraw-color-picker-mode)
+(edraw-color-picker-global-mode)
+#+end_src
+
+You can also manually bind each command without using these minor modes. For example, to open the color picker with mouse-1 and C-c C-o in css-mode and mhtml-mode, configure it as follows.
 
 #+begin_src elisp
 (autoload 'edraw-color-picker-replace-color-at "edraw-color-picker" nil t)
-(autoload 'edraw-color-picker-replace-or-insert-color-at-point "edraw-color-picker" nil t)
+(autoload 'edraw-color-picker-replace-or-insert-color-at "edraw-color-picker" nil t)
 
 (defun my-edraw-color-picker-add-keys (map)
   ;; Replaces the color of the clicked location
   (define-key map [mouse-1] #'edraw-color-picker-replace-color-at)
   ;; C-c C-o replaces the color in place or adds color
   (define-key map (kbd "C-c C-o")
-              #'edraw-color-picker-replace-or-insert-color-at-point))
+              #'edraw-color-picker-replace-or-insert-color-at))
 
 (defun my-edraw-color-picker-enable ()
-  (my-edraw-color-picker-add-keys (or (current-local-map)
-                                      (let ((map (make-sparse-keymap)))
-                                        (use-local-map map)
-                                        map))))
+  (my-edraw-color-picker-add-keys (current-local-map)))
 
 (add-hook 'css-mode-hook 'my-edraw-color-picker-enable)
 (add-hook 'mhtml-mode-hook 'my-edraw-color-picker-enable)
 #+end_src
 
-Settings for use with Customize:
+Settings for use with Customize buffer:
 
 #+begin_src elisp
 (with-eval-after-load "cus-edit"
@@ -285,6 +302,8 @@ Settings for use with Customize:
 #+CAPTION: Show color picker inline
 [[file:./screenshot/color-picker-inline.png]]
 
+edraw-color-picker.el also provides the following functions for use from Emacs Lisp.
+
 Show color picker in minibuffer:
 - (edraw-color-picker-read-color)