add template + document framework in root README

template/README.md: stripped to a one-liner bootstrap command.
README.md: full project docs (structure, add page, add component, build.sh).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Signed-off-by: GnomeZworc <nicolas.boufidjeline@g3e.fr>

template/sources/core/router.js

@@ -0,0 +1,41 @@
+const response = await fetch('./pages.json')
+if (!response.ok) throw new Error('router: failed to load pages.json — run build.sh')
+const PAGES = await response.json()
+
+const MODULE_CACHE = new Map()
+let activeCSS = null
+
+function currentRoute() {
+  const hash = window.location.hash.replace(/^#\//, '') || PAGES[0]?.route || ''
+  return hash.split('?')[0]
+}
+
+async function render(routeName) {
+  const page = PAGES.find(p => p.route === routeName) ?? PAGES[0]
+  const main  = document.querySelector('main')
+  if (!main || !page) return
+
+  const htmlRes = await fetch(page.html)
+  if (!htmlRes.ok) throw new Error(`router: failed to load ${page.html}`)
+  main.innerHTML = await htmlRes.text()
+
+  activeCSS?.remove()
+  activeCSS = null
+  if (page.css) {
+    const link  = document.createElement('link')
+    link.rel    = 'stylesheet'
+    link.href   = page.css
+    document.head.appendChild(link)
+    activeCSS = link
+  }
+
+  if (page.js) {
+    if (!MODULE_CACHE.has(page.js)) {
+      MODULE_CACHE.set(page.js, await import(`../${page.js}`))
+    }
+    MODULE_CACHE.get(page.js)?.init?.(main)
+  }
+}
+
+await render(currentRoute())
+window.addEventListener('hashchange', () => render(currentRoute()))