Add Nostr agent skills

.agents/skills/nostr/SKILL.md

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+---
+name: nostr
+description: Knowledge about the Nostr protocol. Use to view up-to-date NIPs, discover capabilities of the Nostr protocol, and to implement Nostr functionality correctly.
+license: CC-BY-SA-4.0
+---
+
+# Nostr Protocol
+
+Nostr is a simple, open protocol that enables truly censorship-resistant and global social networks using cryptographic keys and signatures.
+
+## Finding Nostr Documentation
+
+All Nostr protocol documentation is maintained in the NIPs (Nostr Implementation Possibilities) repository. To access this information:
+
+### Reading Individual NIPs
+
+Individual NIPs can be fetched from:
+```
+https://github.com/nostr-protocol/nips/blob/master/{NIP}.md
+```
+
+For example, NIP-01 (the basic protocol specification) is available at:
+```
+https://github.com/nostr-protocol/nips/blob/master/01.md
+```
+
+### Finding Event Kinds
+
+Documentation for Nostr event kinds is spread across one or more NIPs. **There is no direct relationship between the NIP number and the kind number.**
+
+To find which NIPs document a specific event kind:
+
+1. First, fetch the README:
+   ```
+   https://github.com/nostr-protocol/nips/blob/master/README.md
+   ```
+
+2. Reference the "Event Kinds" table in the README to find which NIP(s) document the kind you're looking for
+
+### Discovering Existing Capabilities
+
+The README should be consulted to:
+
+- **View the list of NIPs** - Use this to discover what capabilities already exist on the Nostr network
+- **Review client and relay messages** - Understand the communication protocol
+- **Check the list of tags** - See what standardized tags are available
+- **Decide on using existing NIPs** - Before implementing a feature, check if an existing NIP already covers it
+
+### Best Practices
+
+Always start by fetching and reviewing the README to understand the current state of the protocol and avoid reinventing existing functionality.