Updated readme for splitpayments extension

lnbits/extensions/splitpayments/README.md

@@ -1,6 +1,33 @@
 # Split Payments
 
-Set this and forget. It will keep splitting your payments across wallets forever.
+## Have payments split between multiple wallets
+
+LNBits Split Payments extension allows for distributing payments across multiple wallets. Set it and forget it. It will keep splitting your payments across wallets forever.
+
+## Usage
+
+1. After enabling the extension, choose the source wallet that will receive and distribute the Payments
+
+![choose wallet](https://i.imgur.com/nPQudqL.png)
+
+2. Add the wallet or wallets info to split payments to
+
+![split wallets](https://i.imgur.com/5hCNWpg.png) - get the wallet id, or an invoice key from a different wallet. It can be a completely different user as long as it's under the same LNbits instance/domain. You can get the wallet information on the API Info section on every wallet page\
+ ![wallet info](https://i.imgur.com/betqflC.png) - set a wallet _Alias_ for your own identification\
+
+- set how much, in percentage, this wallet will receive from every payment sent to the source wallets
+
+3. When done, click "SAVE TARGETS" to make the splits effective
+
+4. You can have several wallets to split to, as long as the sum of the percentages is under or equal to 100%
+
+5. When the source wallet receives a payment, the extension will automatically split the corresponding values to every wallet\
+   - on receiving a 20 sats payment\
+     ![get 20 sats payment](https://i.imgur.com/BKp0xvy.png)
+   - source wallet gets 18 sats\
+     ![source wallet](https://i.imgur.com/GCxDZ5s.png)
+   - Ben's wallet (the wallet from the example) instantly, and feeless, gets the corresponding 10%, or 2 sats\
+     ![ben wallet](https://i.imgur.com/MfsccNa.png)
 
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