docs: document --find option

README.md

@@ -208,6 +208,7 @@ optional arguments:
   --unpack       output interpreted nbt
   --json         output nbt as json
   --path <path>  output all the matching tags
+  --find <path>  recursively find the first matching tag
 ```
 
 ### Read nbt data
@@ -269,6 +270,13 @@ $ nbt -r my_file.nbt --path "bar" --unpack
 Hello, world!
 ```
 
+If you don't know exactly how to access the data you're interested in you can use the `--find` option to recursively try to match a given path.
+
+```bash
+$ nbt -r my_file.nbt --find "[1]"
+2
+```
+
 ### Write nbt data
 
 You can write nbt data to a file by using the `-w` option. This will