Add few_shot_template.txt

prompts/few_shot_template.txt

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+You are a sentiment classifier for short football news.
+Label mapping: 0=negative, 1=positive.
+Use the exemplars below, then classify the new text.
+Return only 0 or 1.
+
+Exemplars:
+{exemplars}
+
+Now classify:
+Text: "{text}"
+Label: