Add ABOUT and LICENSE file for spans.py

Signed-off-by: Keshav Priyadarshi <git@keshav.space>

Author: keshav-space

src/univers/spans.py.ABOUT

@@ -0,0 +1,16 @@
+about_resource: spans.py
+version: 2.4.1 
+name: Whoosh Spans
+vcs_url: hg+https://bitbucket.org/mchaput/whoosh@72e06bd0aac8
+home_url: https://bitbucket.org/mchaput/whoosh
+owner: Matt Chaput
+copyright: Copyright (c) 2011 Matt Chaput.
+download_url: https://bitbucket.org/mchaput/whoosh/get/2.4.1.tar.gz
+description: Manage spans of tokens and text. 
+ This file was originally copied and modified from Whoosh.
+
+license_expression: bsd-simplified
+
+licenses:
+-   file: spans.py.LICENSE
+    key: bsd-simplified

src/univers/spans.py.LICENSE

@@ -0,0 +1,26 @@
+Copyright 2011 Matt Chaput. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+   1. Redistributions of source code must retain the above copyright notice,
+      this list of conditions and the following disclaimer.
+
+   2. Redistributions in binary form must reproduce the above copyright
+      notice, this list of conditions and the following disclaimer in the
+      documentation and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY MATT CHAPUT ``AS IS'' AND ANY EXPRESS OR
+IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+EVENT SHALL MATT CHAPUT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
+OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+The views and conclusions contained in the software and documentation are
+those of the authors and should not be interpreted as representing official
+policies, either expressed or implied, of Matt Chaput.