doc: more docs

README.md

@@ -22,7 +22,7 @@ const connector = new TonhubConnector({ testnet: true });
 ### Creating session
 
 ```typescript
-let session = await connector.createNewSession({
+let session: TonhubCreatedSession = await connector.createNewSession({
     name: 'Your app name',
     url: 'Your app url'
 });
@@ -36,7 +36,7 @@ const sessionLink = session.link;
 ### Await session confirmation
 
 ```typescript
-const session = await connector.awaitSessionReady(sessionId, 5 * 60 * 1000); // 5 min timeout
+const session: TonhubSessionAwaited = await connector.awaitSessionReady(sessionId, 5 * 60 * 1000); // 5 min timeout
 
 if (session.state === 'revoked' || session.state === 'expired') {
     // Handle revoked or expired session
@@ -62,5 +62,79 @@ if (session.state === 'revoked' || session.state === 'expired') {
 }
 ```
 
+### Check session validity
+After session established it is useful to check from time to time that session wasn't revoked
+
+```typescript
+const session: TonhubSessionState = await connector.getSessionState(sessionId);
+```
+
+### Request transaction
+
+```typescript
+// Request body
+const request: TonhubTransactionRequest = {
+    seed: sessionSeed, // Session Seed
+    appPublicKey: walletConfig.appPublicKey, // Wallet's app public key
+    to: 'EQCkR1cGmnsE45N4K0otPl5EnxnRakmGqeJUNua5fkWhales', // Destination
+    value: '10000000000', // Amount in nano-tons
+    timeout: 5 * 60 * 1000, // 5 minut timeout
+    stateInit: '....', // Optional serialized to base64 string state_init cell
+    text: 'Hello world', // Optional comment. If no payload specified - sends actual content, if payload is provided this text is used as UI-only hint
+    payload: '....' // Optional serialized to base64 string payload cell
+};
+const response: TonhubTransactionResponse = await connector.requestTransaction(request);
+if (response.type === 'rejected') {
+    // Handle rejection
+} else if (response.type === 'expired') {
+    // Handle expiration
+} else if (response.type === 'invalid_session') {
+    // Handle expired or invalid session
+} else if (response.type === 'success') {
+    // Handle successful transaction
+    const externalMessage = response.response; // Signed external message that was sent to the network
+} else {
+    throw new Error('Impossible');
+}
+```
+
+### Request signature
+In tonhub user user signs both text and binary payload, but only text is presented to the user. For future compatibility we recommend to prefix your cell binary payload with `0x00000000`.
+```typescript
+
+const payloadToSign = Buffer.concat([Buffer.from([0, 0, 0, 0]), Buffer.from('Some random string')]);
+const payload = beginCell()
+    .storeBuffer(payloadToSign)
+    .endCell()
+    .toBoc({idx:false})
+    .toString('base64');
+const text = 'Please, sign our terms or service and privacy policy';
+
+// Request body
+const request: TonhubSignRequest = {
+    seed: sessionSeed, // Session Seed
+    appPublicKey: walletConfig.appPublicKey, // Wallet's app public key
+    timeout: 5 * 60 * 1000, // 5 minut timeout
+    text: 'Hello world', // Text to sign, presented to the user.
+    payload: payload // Optional serialized to base64 string payload cell
+};
+const response: TonhubSignResponse = await connector.requestSign(request);
+if (response.type === 'rejected') {
+    // Handle rejection
+} else if (response.type === 'expired') {
+    // Handle expiration
+} else if (response.type === 'invalid_session') {
+    // Handle expired or invalid session
+} else if (response.type === 'success') {
+    // Handle successful transaction
+    const signature = response.signature;
+
+    // You can check signature on the backend with TonhubConnector.verifySignatureResponse
+    let correctSignature = TonhubConnector.verifySignatureResponse({ signature: signature, config: walletConfig });
+} else {
+    throw new Error('Impossible');
+}
+```
+
 # License 
 MIT