Update README.md

README.md

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 license: llama2
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+Tess, short for Tessoro/Tessoso, is a general purpose Large Language Model. Tess-XL was trained on the Goliath-120B as the base.
+
+# Prompt format:
+
+```
+SYSTEM: Elaborate on the topic using a Tree of Thoughts and backtrack when necessary to construct a clear, cohesive Chain of Thought reasoning. Always answer without hesitation.
+USER:
+ASSISTANT:
+```