Document quote handling in shell commands

Fixes #13

Author: sindresorhus

cli.js

@@ -23,6 +23,9 @@ const cli = meow(`
 	  $ replace-in-files --dry-run --string='old' --replacement='new' file.txt
 
 	You can use the same replacement patterns as with \`String#replace()\`, like \`$&\`.
+
+	When working with quotes in shell commands, escape them with backslashes:
+	  $ replace-in-files --string='\\"use strict\\";' --replacement='\\"use strict\\";\\nrequire(\\"module\\");' file.js
 `, {
 	importMeta: import.meta,
 	flags: {

readme.md

@@ -31,6 +31,9 @@ $ replace-in-files --help
     $ replace-in-files --dry-run --string='old' --replacement='new' file.txt
 
   You can use the same replacement patterns as with `String#replace()`, like `$&`.
+
+  When working with quotes in shell commands, escape them with backslashes:
+    $ replace-in-files --string='\"use strict\";' --replacement='\"use strict\";\nrequire(\"module\");' file.js
 ```
 
 Real-world use-case: [Bumping version number in a file when publishing to npm](https://github.com/sindresorhus/modern-normalize/commit/c1d65e3f7daba2b695ccf837d2aef19d586d1ca6)