Merge pull request 'Go file' (#1) from feature1 into main

Reviewed-on: #1

feat.go

@@ -0,0 +1,13 @@
+package mypkg
+
+import "testing"
+
+func TestAddition(t *testing.T) {
+    got := Add(1, 1)
+    want := 2
+    if got != want {
+        t.Errorf("Add(1, 1) = %d; want %d", got, want)
+    }
+}
+
+#тестовый файл