Added examples folder

Imported from CityOfZion/neo-storm (77d0e5949470b2648acd37c71116f4469197772b).

examples/check_witness.go

@@ -0,0 +1,17 @@
+package check_witness_contract
+
+import (
+	"github.com/CityOfZion/neo-go-sc/interop/runtime"
+	"github.com/CityOfZion/neo-go-sc/interop/util"
+)
+
+// Check if the invoker of the contract is the specified owner.
+
+var owner = util.FromAddress("Aej1fe4mUgou48Zzup5j8sPrE3973cJ5oz")
+
+func Main() bool {
+	if runtime.CheckWitness(owner) {
+		return true
+	}
+	return false
+}

interop/runtime/runtime.go

@@ -0,0 +1,6 @@
+package runtime
+
+// CheckWitness verifies if the given hash is the invoker of the contract.
+func CheckWitness(hash []byte) bool {
+	return true
+}

interop/util/util.go

@@ -0,0 +1,6 @@
+package util
+
+// FromAddress is an utility function that converts an NEO address to its hash.
+func FromAddress(address string) []byte {
+	return nil
+}