readme: add guides for the write to db feature

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

readme.md

@@ -2,7 +2,7 @@
 
 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.  
+period and even write them to a sqlite database.
 
 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
@@ -24,14 +24,42 @@ automatically logged out on your Phone's app**
     $ unfold login
     ```
 
-2. Then you can fetch your transactions in plaintext using:
-    ```bash
-    $ unfold transactions -h
-    ```
+2. Then you can fetch your transactions:  
+
+    a. In plaintext:
+      ```bash
+      $ unfold transactions
+      ```
+
+    b. In plaintext and also write to a db:
+      ```bash
+      # Write to a local file called `db.sqlite` by default
+      $ unfold transactions -s 2023-09-20 --db
+      ```
+
+    c. For a complete glossary of available options:
+      ```
+      $ unfold transactions -h
+      Prints the transactions from all of your accounts (default period: 1 month)
+
+      Usage:
+        unfold transactions [flags]
+
+      Flags:
+        -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")
+
+      Global Flags:
+            --config string   config file (default is $HOME/.config/unfold/config.yaml)
+        -v, --debug           Enable debug mode
+      ```
 
 There are a few more subcommands which Unfold provides and uses internally. You
 can get a list by:
-```bash
+```
 $ unfold
 An unofficial cli client for fold.money