add logo

- fixes #13

Author: casperdcl

README.rst

@@ -1,3 +1,5 @@
+|Logo|
+
 shtab
 =====
 
@@ -317,6 +319,8 @@ for more guidance.
 
 |Hits|
 
+.. |Logo| image:: https://github.com/iterative/shtab/blob/master/meta/logo.png
+
 .. |Tests| image:: https://github.com/iterative/shtab/workflows/Test/badge.svg
    :target: https://github.com/iterative/shtab/actions
    :alt: Tests