add license

Author: doerners

LICENSE.md

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+The Bibliometrics Quick Notes are made available under the [Creative Commons
+Attribution license](https://creativecommons.org/licenses/by/4.0/deed.en). The following is a human-readable summary of
+(and not a substitute for) the [full legal text of the CC BY 4.0
+license](https://creativecommons.org/licenses/by/4.0/legalcode.en).
+
+You are free:
+
+- to **Share**---copy and redistribute the material in any medium or format
+- to **Adapt**---remix, transform, and build upon the material
+
+for any purpose, even commercially.
+
+The licensor cannot revoke these freedoms as long as you follow the license
+terms.
+
+Under the following terms:
+
+- **Attribution**---You must give appropriate credit, provide a [link to the
+  license]((https://creativecommons.org/licenses/by/4.0/deed.en)), and indicate if changes were made. 
+  You may do so in any reasonable manner, but not in any way that suggests the licensor endorses
+  you or your use.
+
+- **No additional restrictions**---You may not apply legal terms or
+  technological measures that legally restrict others from doing anything the
+  license permits.  With the understanding that:
+
+Notices:
+
+* You do not have to comply with the license for elements of the material in
+  the public domain or where your use is permitted by an applicable exception
+  or limitation.
+* No warranties are given. The license may not give you all of the permissions
+  necessary for your intended use. For example, other rights such as publicity,
+  privacy, or moral rights may limit how you use the material.