Update README with install information

README.md

@@ -81,6 +81,21 @@ And here it is using this macro:
 
 Much easier, in this author's humble opinion.
 
+## Install
+
+This package is not currently on MELPA or anywhere, so either `git clone` this
+repo and add it to your `load-path` and `require` it, or use some other
+installation method.
+
+I use `straight.el`:
+
+```lisp
+(straight-get-package
+ '(define-repeat-map
+   :host nil
+   :repo "https://tildegit.org/acdw/define-repeat-map.el"))
+```
+
 ## Similar packages
 
 I've found one other package that tries to simplify repeat-map definition, but