Add Citation.cff (#5130)

CITATION.cff

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+# This CITATION.cff file was generated with cffinit.
+# Visit https://bit.ly/cffinit to generate yours today!
+
+cff-version: 1.2.0
+title: Auto-GPT
+message: >-
+  If you use this software, please cite it using the
+  metadata from this file.
+type: software
+authors:
+  - name: Significant Gravitas
+    website: 'https://agpt.co'
+repository-code: 'https://github.com/Significant-Gravitas/Auto-GPT'
+url: 'https://agpt.co'
+abstract: >-
+  An experimental open-source attempt to make GPT-4 fully
+  autonomous.
+keywords:
+  - AI
+  - Agent
+license: MIT