chore: add site config and README (#2)

Author: streamcode9

README.md

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+# Streamcode9 Blog
+
+This repository hosts a simple Jekyll-based site for experiments and notes.
+
+## Project goals
+- Share code snippets, blog posts, and musical riffs.
+- Serve as personal notes and experiments.
+
+## Build steps
+1. Install Ruby and Jekyll (`gem install bundler jekyll`).
+2. Build the site locally with `jekyll serve`.
+
+## Deployment
+Pushing to the `main` branch builds and deploys the site via GitHub Pages.

_config.yml

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+title: Streamcode9 Blog
+description: A space for sharing code experiments and musical riffs.
+theme: minima