readme: update guides for the watch transactions feature

Signed-off-by: Gunwant Jain <[email protected]>

readme.md

@@ -2,7 +2,9 @@
 
 Unfold is an unofficial [Fold Money](https://fold.money) CLI client, which
 covers the bare minimum API routes to fetch your transactions for a given
-period and even write them to a sqlite database.
+period and even write them to a sqlite database. It also provides options for
+running an internal cron job through which this CLI acts as a daemon and
+fetches transactions every time the cron job's timer is met.
 
 Fold's API is not publically available, I had to MITM their app to write this
 tool, and so **there might be unforeseen consequences for your Fold account if
@@ -37,6 +39,15 @@ automatically logged out on your Phone's app**
       $ unfold transactions -s 2023-09-20 --db
       ```
 
+    c. Create an internal cron job to fetch transactions every 6 hours and save them to a db: 
+      ```bash
+      # Note: You need to enable the `-d` or `--db` flag to ensure that the changes are written to a database
+      $ unfold transactions -s 2023-09-20 --db -w '@every 20s'
+      12:19AM INF Cron job set for fetching transactions, going into daemon mode
+      12:19AM INF Fetched transactions till 2023-10-17
+      12:20AM INF Fetched transactions till 2023-10-16
+      ```
+
     c. For a complete glossary of available options:
       ```
       $ unfold transactions -h
@@ -49,12 +60,14 @@ automatically logged out on your Phone's app**
         -d, --db               Save the results in a sqlite db
         -D, --db-path string   Sets path for the database (default "db.sqlite")
         -h, --help             help for transactions
-        -s, --since string     fetch transactions since in this format: YYYY-MM-DD (default "2023-09-15")
-        -t, --till string      fetch transactions till in this format: YYYY-MM-DD (default "2023-10-16")
+        -s, --since string     fetch transactions since in this format: YYYY-MM-DD (default "XXXX-XX-XX")
+        -t, --till string      fetch transactions till in this format: YYYY-MM-DD (default "XXXX-XX-XX")
+        -w, --watch string     Set an internal cron job to trigger this command. You can use non-standard cron expressions like '@every 6h'. This will disable plaintext mode, so add a '-d' flag if you want to write to db
 
       Global Flags:
             --config string   config file (default is $HOME/.config/unfold/config.yaml)
         -v, --debug           Enable debug mode
+            Prints the transactions from all of your accounts (default period: 1 month)
       ```
 
 There are a few more subcommands which Unfold provides and uses internally. You