Per #27: Add opinionated mode-line entry pointsexternals/breadcrumb

* breadcrumb.el (breadcrumb-opinionated-mlf): New defcustom.
(breadcrumb-opinionated-diminished-modes): New defcustom.
(bc--saved-mlf, bc--saved-lighters): New variables.
(bc--diminish): New function.
(breadcrumb-opinionated-mode): New global minor mode.

* README.md: Fix "is a global mode" grammar.  Add "An opinionated
mode line" section.

1 files changed, 15 insertions, 2 deletions

diff --git a/README.md b/README.md
index 2d343fa..2eb8585 100644
--- a/README.md
+++ b/README.md
@@ -9,7 +9,7 @@ Breadcrumbs are sequences of short strings indicating where you are in
 some big tree-like maze that is probably your code.  Hopefully the
 screenshot above clears it up.
 
-* `M-x breadcrumb-mode` is global mode.  Will try to turn itself on
+* `M-x breadcrumb-mode` is a global mode.  Will try to turn itself on
   conservatively and only if there's a project.
 
 * `M-x breadcrumb-local-mode` is a buffer-local minor mode, if you
@@ -38,11 +38,24 @@ and
 
 ```lisp
 (:eval (breadcrumb-project-crumbs))
-```    
+```
 
 in your settings of the `mode-line-format` or `header-line-format`
 variables.
 
+## An opinionated mode line
+
+If you had trouble understanding the previous section and just want to
+get breadcrumbs on the mode-line, you can call `M-x
+breadcrumb-opinionated-mode`.  Looks like this:
+
+![opinionated](./opinionated.png)
+
+Call it again to turn it off.  Also, you probably want to check how
+the variable `breadcrumb-opinionated-mlf` is built so you can
+adjust/customize it.  Or just steal ideas from it into your own
+`mode-line-format` `header-line-format` customizations.
+
 ## Tweaks
 
 The shape and size of each breadcrumb groups may be tweaked via