✨(sdk) add sdk projects

It includes a consumer project which is simply a demo app. The sdk
project includes the first version of the SDK, with a light React
implementation. The first version lays down the foundations of
the iframe sdk framework. The npm package logic is also already
ready to be published.

src/sdk/consumer/src/App.css

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+#root {
+  margin: 0 auto;
+
+  text-align: center;
+}

src/sdk/consumer/src/App.tsx

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+import { VisioCreateButton } from "@gouvfr-lasuite/visio-sdk";
+import "./App.css";
+import { useState } from "react";
+
+function App() {
+  const [roomUrl, setRoomUrl] = useState("");
+
+  return (
+    <form className="form">
+      <div className="header">
+        <h2>Create event</h2>
+        <span>Visio demo app</span>
+      </div>
+      <div className="group">
+        <label>Subject</label>
+        <input type="text" />
+      </div>
+      <div className="group">
+        <label>Place</label>
+        <input type="text" />
+      </div>
+      <div className="group">
+        <label>Visioconference</label>
+        <VisioCreateButton onRoomCreated={setRoomUrl} />
+      </div>
+      <div className="group">
+        <label>Description</label>
+        <textarea />
+      </div>
+      <button
+        type="button"
+        onClick={() => {
+          alert("Room url: " + roomUrl);
+        }}
+      >
+        Create
+      </button>
+    </form>
+  );
+}
+
+export default App;

src/sdk/consumer/src/index.css

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+* {
+  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
+    "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif,
+    "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
+  box-sizing: border-box;
+  color: rgb(9, 9, 11);
+}
+
+body {
+  background-color: oklch(0.985 0 0);
+  display: flex;
+  justify-content: center;
+  padding-top: 2rem;
+}
+
+h2 {
+  margin: 0;
+}
+
+span {
+  font-size: 14px;
+  color: oklch(0.372 0.044 257.287);
+}
+
+.form {
+  display: flex;
+  flex-direction: column;
+  width: 500px;
+  gap: 1rem;
+  border: 1px solid #e5e7eb;
+  background-color: white;
+  border-radius: 1rem;
+  padding: 3rem;
+}
+
+.header {
+  margin-bottom: 2rem;
+}
+
+.group {
+  display: flex;
+  flex-direction: column;
+  align-items: flex-start;
+  gap: 0.5rem;
+}
+
+label {
+  color: rgb(9, 9, 11);
+  font-weight: 500;
+  font-size: 14px;
+}
+
+input,
+textarea {
+  border: 1px rgb(228, 228, 231) solid;
+  border-radius: 6px;
+  height: 36px;
+  width: 100%;
+  padding: 0.75rem;
+}
+
+textarea {
+  height: 200px;
+}
+
+button {
+  background-color: rgb(45, 45, 70);
+  color: white;
+  height: 46px;
+  border-radius: 4px;
+  font-size: 16px;
+  font-weight: 300;
+  cursor: pointer;
+}

src/sdk/consumer/src/main.tsx

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+import { StrictMode } from 'react'
+import { createRoot } from 'react-dom/client'
+import './index.css'
+import App from './App.tsx'
+
+createRoot(document.getElementById('root')!).render(
+  <StrictMode>
+    <App />
+  </StrictMode>,
+)

src/sdk/consumer/src/vite-env.d.ts

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+/// <reference types="vite/client" />