Added prompt techniques

forge/autogpt/prompts/techniques/chain-of-thought.j2

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+{% block prompt %} {% endblock %}
+Let's work this out in a step by step way to be sure we have the right answer.

forge/autogpt/prompts/techniques/few-shot.j2

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+{% block prompt %} {% endblock %}
+Examples:
+    {% for example in examples %}
+    - {{ example }}
+    {% endfor %}