feat: add recipes, a custom goose agent configuration (#2115)

crates/goose/src/prompts/recipe.md

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+Based on our conversation so far, could you create:
+
+1. A concise set of instructions (1-2 paragraphs) that describe what you've been helping with. Make the instructions generic, and higher-level so that can be re-used across various similar tasks. Pay special attention if any output styles or formats are requested (and make it clear), and note any non standard tools used or required.
+
+2. A list of 3-5 example activities (as a few words each at most) that would be relevant to this topic
+
+Format your response in _VALID_ json, with one key being `instructions` which contains a string, and the other key `activities` as an array of strings.
+For example, perhaps we have been discussing fruit and you might write:
+
+{
+"instructions": "Using web searches we find pictures of fruit, and always check what language to reply in.",
+"activities": [
+"Show pics of apples",
+"say a random fruit",
+"share a fruit fact"
+]
+}