Updated documentation

docs/readme.md

@@ -12,18 +12,30 @@ cargo install fnl
 
 Show status:
 
+```shell
+fnl file.txt
+```
+
 ```shell
 find . -type f -name "*.txt" | xargs fnl
 ```
 
 Add final newlines:
 
+```shell
+fnl --add file.txt
+```
+
 ```shell
 find . -type f -name "*.txt" | xargs fnl --add
 ```
 
 Remove final newlines:
 
+```shell
+fnl --remove file.txt
+```
+
 ```shell
 find . -type f -name "*.txt" | xargs fnl --remove
 ```