Update LICENSE

LICENSE

@@ -1,3 +1,37 @@
+Instructional Material
+
+All instructional material is made available under the Creative
+Commons Attribution license. You are free:
+
+* to Share---to copy, distribute and transmit the work
+* to Remix---to adapt the work
+
+Under the following conditions:
+
+* Attribution---You must attribute the work using "Copyright (c)
+  Barbagroup" (but not in any way that suggests that we
+  endorse you or your use of the work).  Where practical, you must
+  also include a hyperlink to https://github.com/numerical-mooc/numerical-mooc.
+
+With the understanding that:
+
+* Waiver---Any of the above conditions can be waived if you get
+  permission from the copyright holder.
+* Other Rights---In no way are any of the following rights
+  affected by the license:
+    * Your fair dealing or fair use rights;
+    * The author's moral rights;
+    * Rights other persons may have either in the work itself or in
+      how the work is used, such as publicity or privacy rights.  *
+* Notice---For any reuse or distribution, you must make clear to
+  others the license terms of this work. The best way to do this is
+  with a link to http://creativecommons.org/licenses/by/3.0/.
+
+For the full legal text of this license, please see:
+  http://creativecommons.org/licenses/by/3.0/legalcode
+
+Software
+
 The MIT License (MIT)
 
 Copyright (c) 2014 Barba group
@@ -18,4 +52,4 @@ 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.
+SOFTWARE.