add citation file

CITATION.cff

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+cff-version: 1.2.0
+message: Please cite the following works when using this software.
+type: software
+abstract: Python wrapper for the Mastodon ( https://github.com/mastodon/mastodon/ ) API.
+authors:
+  - family-names: Diener
+    given-names: Lorenz
+  - family-names: codl
+  - family-names: Rittner
+    given-names: Aljoscha
+  - family-names: Šedivý
+    given-names: Miroslav
+  - name: aeonofdiscord
+  - family-names: Myers
+    given-names: Elizabeth
+  - family-names: Piper
+    given-names: Andy
+  - name: golint fixer
+  - family-names: Lain
+  - family-names: Bram
+  - family-names: Kawamoto
+    given-names: Junpei
+  - family-names: Detiste
+    given-names: Alexandre
+  - family-names: Dunstone
+    given-names: Gareth
+  - family-names: Conscience
+    given-names: GCU Prosthetic
+  - family-names: Eaton
+    given-names: Mark
+  - family-names: Thompson
+    given-names: Will
+  - family-names: Fraser
+    given-names: James
+  - family-names: Arm
+    given-names: Jeong
+  - family-names: naoya_t
+  - name: theo court
+  - family-names: Calvar
+    given-names: Théo Le
+  - family-names: Anthony
+    given-names: Noëlle
+  - family-names: Moore
+    given-names: James
+  - family-names: Laxson
+    given-names: Jack
+  - family-names: Ciesla
+    given-names: Gwyn
+  - family-names: Piesche
+    given-names: Florian
+  - family-names: Anzorge
+    given-names: Dee
+  - family-names: Mohanan
+    given-names: Ashwin V.
+identifiers:
+  - type: url
+    value: https://github.com/halcy/Mastodon.py
+title: halcy/Mastodon.py
+url: https://github.com/halcy/Mastodon.py