chore: add readme to evm-connector (#155)

Author: LuizAsFight

packages/evm-connector/README.md

@@ -0,0 +1,27 @@
+## 📗 Description
+
+To enable the use of a MetaMask wallet on Fuel we use [Predicates](https://docs.fuel.network/docs/intro/glossary/#predicate) on Fuel Network, that allow transactions to be validated using a script.
+
+Below we share a model that explains how our EVM Connector works.
+
+```mermaid
+sequenceDiagram
+    participant A as Dapp
+    participant B as EVM Wallet Connector
+    participant C as MetaMask (EVM Wallet)
+
+    note over A,C: List Accounts
+    A->>B: fuel.accounts()
+    B->>C: ethProvider.request({ "method": "eth_accounts" })
+    C-->>B: ["0xa202E75a467726Ad49F76e8914c42433c1Ad821F"]
+    B->>B: Create a predicate for each ETH account address
+    B-->>A: ['fuel1s6cswzjfunkarjh9rlr7fdug4r04le2zec9agtudj3gkjwarlwnsw8859m']
+
+    note over A,C: Send Transaction
+    A->>B: fuel.sendTransaction("<address>", { <transaction> })
+    B->>B: Hash transaction Id
+    B->>C: ethProvider.request({ "method": "personal_sign" })
+    C-->>B: "0xa202..<sign hash>..222"
+    B->>B: Send transaction using predicate validation to Fuel Nework
+    B-->>A: "0x111..<transaction ID>..222"
+```