To add Apache License boilerplate.

git-svn-id: https://tufte-latex.googlecode.com/svn/trunk@14 516e2f36-ce3a-0410-bea4-1d4a03f5df72

README.txt

@@ -42,3 +42,19 @@ available at
 Patches are welcome via the issue tracker.  Alternatively,
 if you'd like to become a developer on this project, email
 Bil.Kleb at NASA gov.
+
+== License
+
+Copyright 2007 Bil Kleb and Bill Wood
+
+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.