Add license to README

README.md

@@ -56,6 +56,7 @@
     - [Describe functions](#describe-functions)
 - [How-To's](#how-tos)
 - [Contributions](#contributions)
+- [License](#license)
 - [Special Credits](#special-credits)
 - [Supporting Spacemacs](#supporting-spacemacs)
 - [FAQ](#faq)
@@ -395,6 +396,13 @@ If you are ready to contribute please begin by consulting the
 [contribution guidelines][CONTRIBUTE.md] and [conventions][CONVENTIONS.md],
 thanks!
 
+# License
+
+The license is GPLv3 for all parts specific to `Spacemacs`, this includes:
+- the initialization and core files
+- all the layer files.
+- the documentation
+
 # Special Credits
 
 [Spacemacs logo][] by [Nasser Alshammari][]