chore: add readme to every plugin

plugins/trogonstack-ask/README.md

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+# trogonstack-ask
+
+Structured question-asking skill for gathering requirements and context through deliberate, one-at-a-time questions.
+
+```bash
+claude plugin install trogonstack-ask@trogonstack
+```

plugins/trogonstack-datadog/README.md

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+# trogonstack-datadog
+
+Datadog observability skills for designing dashboards with proper widget selection, layout patterns, and template variables using the pup CLI.
+
+```bash
+claude plugin install trogonstack-datadog@trogonstack
+```

plugins/trogonstack-diataxis/README.md

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+# trogonstack-diataxis
+
+Documentation skills following the Diataxis framework for organizing and generating docs into tutorials, how-to guides, reference, and explanation sections.
+
+```bash
+claude plugin install trogonstack-diataxis@trogonstack
+```

plugins/trogonstack-gh/README.md

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+# trogonstack-gh
+
+GitHub workflow skills for enriching PR descriptions, automating code review context, and streamlining collaboration through the gh CLI.
+
+```bash
+claude plugin install trogonstack-gh@trogonstack
+```

plugins/trogonstack-nats/README.md

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+# trogonstack-nats
+
+NATS messaging skills for designing subject hierarchies with naming conventions and wildcard patterns.
+
+```bash
+claude plugin install trogonstack-nats@trogonstack
+```

plugins/trogonstack-otel/README.md

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+# trogonstack-otel
+
+OpenTelemetry skills for naming metrics and spans following OTel Semantic Conventions.
+
+```bash
+claude plugin install trogonstack-otel@trogonstack
+```