Improve README

contracts/paymaster/README.md

@@ -2,14 +2,26 @@
 
 ## Overview
 
+**Definition of problem**: the user needs to have a gas token (eGLD in case of MultiversX) to be able to do anything on the blockchain.
+This is a hard concept to explain to non-crypto users.
+Also gives some headaches for crypto users as well for the first steps of onboarding.
+Imagine those people who bridge their NFTs or those who bridge USDC to a new account.
+The new account can’t do anything until it does not have some eGLD to pay for the transactions.
+
+In order for users to onboard faster to xPortal (even when it was called Maiar) we introduced the concept of relayed transactions (we have v1, v2 and soon v3 of it).
+This means a relayer can wrap the user transaction inside a relayedTX and in this case the relayer pays for the gas, but the user’s transaction is getting executed.
+Right now, the relayers we use are free of charge, thus they do this service for new users for free, but they actually need eGLD to do the transactions.
+When we speak about a few hundred users, this is not an issue, but when you want to scale up relaying transactions to thousands/millions of users, it becomes unsustainable.
+
+## Implementation
+
 Paymaster is a SC that makes relayed transactions sustainable.
 This means that a user who doesn't own EGLD (native token) can make transactions by paying a fee in another token.
 
 The Paymaster's objective is twofold:
 - take a fee and send it to the Relayers;
 - execute what the user wants to be executed.
 
-## Implementation
 
 The contract has only one endpoint: `forward_execution` and can be called by anyone.
 The user will use `MultiESDTNFTTransfer` support to send multiple payments: