Merge pull request #3 from go-oss/add-license

Add LICENSE file

LICENSE

@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2020 Takenori Nakagawa <[email protected]>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

helper.go

@@ -25,7 +25,9 @@ var (
 	ErrCanceledByUser = errors.New("canceled by user")
 )
 
-// Screenshot is an action that captures screen and save as image file.
+// Screenshot is an action that takes a screenshot of the entire browser viewport and save as image file.
+// Note: this will override the viewport emulation settings.
+// This function is based on https://github.com/chromedp/examples
 func Screenshot(filename string) chromedp.Action {
 	return chromedp.ActionFunc(func(ctx context.Context) error {
 		// get layout metrics