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

dragonchain.go

@@ -1,3 +1,49 @@
+// Package sdk provides a Go SDK for interacting with Dragonchain nodes.
+//
+// All API methods require a context.Context parameter for timeout and cancellation control.
+//
+// Example usage:
+//
+//	package main
+//
+//	import (
+//	    "context"
+//	    "fmt"
+//	    "log"
+//	    "time"
+//
+//	    "git.dragonchain.com/dragonchain/dragonchain-prime-sdk-go"
+//	    "git.dragonchain.com/dragonchain/dragonchain-prime-sdk-go/models"
+//	)
+//
+//	func main() {
+//	    client := sdk.NewDragonchainSDK(
+//	        "your-public-id",
+//	        "your-auth-key-id",
+//	        "your-auth-key",
+//	        "https://your-dragonchain-endpoint.com",
+//	    )
+//
+//	    ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+//	    defer cancel()
+//
+//	    // Check system health
+//	    if err := client.System.Health(ctx); err != nil {
+//	        log.Fatal(err)
+//	    }
+//
+//	    // Create a transaction
+//	    txn := &models.TransactionCreateRequest{
+//	        TxnType: "my-transaction-type",
+//	        Payload: map[string]interface{}{"message": "Hello Dragonchain"},
+//	    }
+//
+//	    resp, err := client.Transaction.Create(ctx, txn)
+//	    if err != nil {
+//	        log.Fatal(err)
+//	    }
+//	    fmt.Printf("Created transaction: %s\n", resp.TransactionID)
+//	}
 package sdk
 
 import (
@@ -9,6 +55,8 @@ import (
 	"git.dragonchain.com/dragonchain/dragonchain-prime-sdk-go/transactiontype"
 )
 
+// DragonchainSDK is the main SDK client for interacting with Dragonchain nodes.
+// It provides access to all API endpoints through specialized client instances.
 type DragonchainSDK struct {
 	client          *client.Client
 	Transaction     *transaction.TransactionClient
@@ -18,6 +66,16 @@ type DragonchainSDK struct {
 	System          *system.SystemClient
 }
 
+// NewDragonchainSDK creates a new Dragonchain SDK client.
+//
+// Parameters:
+//   - 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")
+//
+// Returns a configured SDK client ready to make API calls.
+// All API methods on the returned client require a context.Context parameter.
 func NewDragonchainSDK(publicID, authKeyID, authKey, baseURL string) *DragonchainSDK {
 	c := client.NewClient(publicID, authKeyID, authKey, baseURL)
 	return &DragonchainSDK{
@@ -30,6 +88,8 @@ func NewDragonchainSDK(publicID, authKeyID, authKey, baseURL string) *Dragonchai
 	}
 }
 
+// GetClient returns the underlying HTTP client used by the SDK.
+// This can be useful for advanced use cases or custom implementations.
 func (sdk *DragonchainSDK) GetClient() *client.Client {
 	return sdk.client
 }