add licence infos for this package

LICENCE

@@ -0,0 +1,28 @@
+Copyright (c) 2019, the LSSTDESC sn_tools contributors (https://github.com/LSSTDESC/sn_tools/graphs/contributors).
+
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright notice, this
+  list of conditions and the following disclaimer.
+
+* 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.
+
+* Neither the name of ceci nor the names of its
+  contributors may be used to endorse or promote products derived from
+  this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 THE COPYRIGHT HOLDER 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.

README.md

@@ -1 +1,32 @@
 # sn_tools
+
+A set of python scripts used to run the Survey Strategy Support pipeline.
+
+```
+This software was developed within the LSST DESC using LSST DESC resources, and so meets t
+he criteria 
+given in, and is bound by, the LSST DESC Publication Policy for being a "DESC product". 
+We welcome requests to access code for non-DESC use; if you wish to use the code outside D
+ESC 
+please contact the developers.
+
+```
+## Release Status
+
+This code is under development and has not yet been released.
+
+
+
+## Feedback, License etc
+
+If you have comments, suggestions or questions, please [write us an issue](https://github.
+com/LSSTDESC/sn_tools/issues).
+
+This is open source software, available for re-use under the modified BSD license.
+
+```
+Copyright (c) 2019, the sn_tools contributors on GitHub, https://github.com/LSSTDESC/sn_tools/graphs/contributors.
+All rights reserved.
+```
+
+