docs: add more examples

Author: replydev

README.md

@@ -36,8 +36,14 @@ cotp edit --index 4 --digits 8
 # List all the codes in JSON format passing password through stdin
 echo "mysecretpassword" | cotp --password-stdin list --json
 
+# Extract the first matching OTP code with "google" issuer and copy it into the clipboard
+echo "mysecretpassword" | cotp extract --issuer google --copy-clipboard
+
 # Import an encrypted Aegis Database backup
 cotp import --path my_db.json --aegis-encrypted
+
+# Export the cotp database
+cotp export
 ```
 
 ## Compatibility