add license header and edit the package doc

1 files changed, 17 insertions, 2 deletions

diff --git a/up.go b/up.go
index aed7c12..b1ba332 100644
--- a/up.go
+++ b/up.go
@@ -1,5 +1,20 @@
-// up is the ultimate pipe composer/editor. It helps building Linux pipelines
-// in a terminal-based UI interactively, with live preview of command results.
+// Copyright 2018 The up Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// up is the Ultimate Plumber, a tool for writing Linux pipes in a
+// terminal-based UI interactively, with instant live preview of command
+// results.
 package main
 
 import (