chg: update README

Author: jdkanani

README.md

@@ -1,20 +1,43 @@
 # fx-portal
 FxPortal for Matic chain. No mapping. Seamless.
 
-## How Matic state transfer works?
+**Warning:** Code is not audited.
 
-## Why they are many bridges?
+### What is FxChild and FxRoot?
 
-## Can I built my own bridge?
+`FxChild` and `FxRoot` are main contracts on which mapping-less bridge works. It calls and passes data to user-defined methods on another chain without mapping.
 
-## What is Fx bridge (fx-portal)?
+I have already deployed both contracts:
+
+**Mumbai**
+
+[FxRoot (Goerli)](https://goerli.etherscan.io/address/0x3d1d3E34f7fB6D26245E6640E1c50710eFFf15bA#code): `0x3d1d3E34f7fB6D26245E6640E1c50710eFFf15bA`
+
+[FxChild (Mumbai)](https://explorer-mumbai.maticvigil.com/address/0xCf73231F28B7331BBe3124B907840A94851f9f11/contracts):  `0xCf73231F28B7331BBe3124B907840A94851f9f11`
+
+**Mainnet**
+
+[FxRoot (Ethereum Mainnet)](https://etherscan.io/address/0xfe5e5d361b2ad62c541bab87c45a0b9b018389a2#code): `0xfe5e5D361b2ad62c541bAb87C45a0B9B018389a2`
+
+[FxChild (Matic Mainnnet)](https://explorer-mainnet.maticvigil.com/address/0x8397259c983751DAf40400790063935a11afa28a/contracts): `0x8397259c983751DAf40400790063935a11afa28a`
+
+
+
+### How Matic state transfer works?
+
+### Why they are many bridges?
+
+### Can I built my own bridge?
+
+### What is Fx bridge (fx-portal)?
 
 Meta bridge :) 
 
 Bridge which allows any type of state sync without mapping.
 
-## What can I build with it?
+### What can I build with it?
+
+* Arbitrary state bridge (examples/state-transfer)
+* Normal ERC20 bridge (examples/erc2-transfer)
+* ERC20 token generator bridge (example/mintable-erc20-transfer)
 
-* ERC20 bridge
-* Mintable ERC20 bridge
-* Token generator (dynamic ERC20 token creator without new mapping)