Add context.Context parameter to all API methods

Enable request timeout and cancellation control by adding context.Context
as the first parameter to all SDK API methods. This allows users to:
- Set per-request timeouts
- Cancel in-flight requests
- Pass request-scoped values

README.md

@@ -14,8 +14,10 @@ go get git.dragonchain.com/dragonchain/dragonchain-prime-sdk-go
 package main
 
 import (
+    "context"
     "fmt"
     "log"
+    "time"
 
     "git.dragonchain.com/dragonchain/dragonchain-prime-sdk-go"
     "git.dragonchain.com/dragonchain/dragonchain-prime-sdk-go/models"
@@ -30,13 +32,17 @@ func main() {
         "https://your-dragonchain-endpoint.com",
     )
 
+    // Create a context with timeout
+    ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+    defer cancel()
+
     // Check system health
-    if err := client.System.Health(); err != nil {
+    if err := client.System.Health(ctx); err != nil {
         log.Fatal("Health check failed:", err)
     }
 
     // Get system status
-    status, err := client.System.Status()
+    status, err := client.System.Status(ctx)
     if err != nil {
         log.Fatal("Failed to get status:", err)
     }
@@ -51,7 +57,7 @@ func main() {
         Tag: "example-tag",
     }
 
-    resp, err := client.Transaction.Create(txn)
+    resp, err := client.Transaction.Create(ctx, txn)
     if err != nil {
         log.Fatal("Failed to create transaction:", err)
     }
@@ -61,31 +67,34 @@ func main() {
 
 ## Available Endpoints
 
+All API methods accept a `context.Context` as their first parameter for timeout and cancellation control.
+
 ### System
-- `Health()` - Check system health
-- `Status()` - Get system status
+- `Health(ctx)` - Check system health
+- `Status(ctx)` - Get system status
 
 ### Transaction
-- `Create(req)` - Create a new transaction
-- `CreateBulk(req)` - Create multiple transactions
-- `Get(transactionID)` - Get transaction by ID
+- `Create(ctx, req)` - Create a new transaction
+- `CreateBulk(ctx, req)` - Create multiple transactions
+- `Get(ctx, transactionID)` - Get transaction by ID
+- `List(ctx)` - List all transactions
 
 ### Transaction Type
-- `Create(req)` - Create a new transaction type
-- `Get(txnType)` - Get transaction type by name
-- `List()` - List all transaction types
-- `Delete(txnType)` - Delete a transaction type
+- `Create(ctx, req)` - Create a new transaction type
+- `Get(ctx, txnType)` - Get transaction type by name
+- `List(ctx)` - List all transaction types
+- `Delete(ctx, txnType)` - Delete a transaction type
 
 ### Smart Contract
-- `Create(req)` - Create a new smart contract
-- `Get(contractID)` - Get smart contract by ID
-- `List()` - List all smart contracts
-- `Update(contractID, req)` - Update a smart contract
-- `Upload(contractID, req)` - Upload smart contract code
-- `Delete(contractID)` - Delete a smart contract
+- `Create(ctx, req)` - Create a new smart contract
+- `Get(ctx, contractID)` - Get smart contract by ID
+- `List(ctx)` - List all smart contracts
+- `Update(ctx, contractID, req)` - Update a smart contract
+- `Upload(ctx, contractID, filepath)` - Upload smart contract code
+- `Delete(ctx, contractID)` - Delete a smart contract
 
 ### Block
-- `Get(blockID)` - Get block by ID
+- `Get(ctx, blockID)` - Get block by ID
 
 ## Authentication
 
@@ -93,4 +102,4 @@ The SDK uses HMAC-SHA256 authentication. You need to provide:
 - `publicID` - Your Dragonchain public ID
 - `authKeyID` - Your authentication key ID
 - `authKey` - Your authentication key
-- `baseURL` - The base URL of your Dragonchain node (e.g., "https://mychain.dragonchain.com")
+- `baseURL` - The base URL of your Dragonchain node (e.g., "https://chains.dragonchain.com")