[doc] authors file added

AUTHORS.rst

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+Searx was created and is maintained by Adam Tauber.
+
+Major contributing authors:
+
+- Adam Tauber <asciimoo@gmail.com> `@asciimoo <https://github.com/asciimoo>`_
+- Matej Cotman
+- Thomas Pointhuber
+- Alexandre Flament
+
+People who have submitted patches/translates, reported bugs, consulted features or
+generally made searx better:
+
+- Laszlo Hammerl
+- Stefan Marsiske
+- Gabor Nagy
+- @pw3t
+- @rhapsodhy
+- András Veres-Szentkirályi
+- Benjamin Sonntag
+- @HLFH
+- @TheRadialActive
+- @Okhin
+- André Koot
+- Alejandro León Aznar
+- rike
+- dp