add nickpatrick team homework

teams/nickpatric/homework-2.md

@@ -0,0 +1,24 @@
+### 创建合约Hash
+> 1c9f50a110bf89b4778368ba85dc1268174d5871876ce9c31f54dd9d8d312bf4
+### 调用合约Hash
+> 08eba71dc6594045234c723d5d70cb50c8cdfd5db1007ecc2110c6b6acbff600
+### 源代码
+
+  ```ts
+
+access(all) contract HelloWorld {
+  pub let greeting: String
+  pub event HelloEvent(message: String)
+
+  init() {
+    self.greeting = "Hello, World!"
+  }
+
+  pub fun hello(message: String): String {
+    emit HelloEvent(message: message)
+    return self.greeting
+  }
+}
+
+
+```

teams/nickpatric/homework-3.md

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+
+
+- [DemoNFT](https://flow-view-source.com/testnet/account/0xbf39498652268605/contract/DemoNFT)
+- [DemoVoting](https://flow-view-source.com/testnet/account/0xbf39498652268605/contract/DemoApprovalVoting)

teams/nickpatric/homework-4.md

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+# Flow Go-SDK
+
+- Go module file 
+- 
+```go
+module flow-grants
+
+go 1.16
+
+require (
+	github.com/onflow/cadence v0.15.0 // indirect
+	github.com/onflow/flow-go-sdk v0.19.0 // indirect
+	google.golang.org/grpc v1.37.1 // indirect
+)
+
+
+```
+
+- Go-sdk demo codes
+
+```go
+
+package main
+
+import (
+	"context"
+	"fmt"
+	"github.com/onflow/cadence"
+	"github.com/onflow/flow-go-sdk/client"
+	"google.golang.org/grpc"
+)
+
+func main(){
+	flowClient, err := client.New("access.devnet.nodes.onflow.org:9000", grpc.WithInsecure())
+	if err != nil {
+		panic(err)
+	}
+
+	blockEvents, err := flowClient.GetEventsForHeightRange(context.Background(), client.EventRangeQuery{
+		Type:        "A.7e60df042a9c0868.FlowToken.TokensDeposited",
+		StartHeight: 31267819,
+		EndHeight:   31267829,
+	})
+
+	for _, blockEvent := range blockEvents {
+		for _, event := range blockEvent.Events {
+			amount := event.Value.Fields[0].(cadence.UFix64).ToGoValue().(uint64)
+			address := event.Value.Fields[1].(cadence.Optional).Value.(cadence.Address).String()
+			fmt.Println("amount--- ", amount)
+			fmt.Println("address -- ", address)
+		}
+	}
+}
+
+```