add readme

README.md

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+# VueJS 3 + ViteJS + ThreeJS
+
+I wanted to try to write a lib similar to [react-three-fiber](https://github.com/react-spring/react-three-fiber) but for VueJS.
+
+## PoC
+
+I first made a simple *Proof of Concept*, take a look at [Test.vue](/src/components/Test.vue) :
+
+```html
+  <Renderer ref="renderer" :animate="anim">
+    <PerspectiveCamera :position="{ z: 100 }"></PerspectiveCamera>
+
+    <PhongMaterial name="mat1" color="#ff0000"></PhongMaterial>
+    <LambertMaterial name="mat2" color="#0000ff"></LambertMaterial>
+
+    <Scene>
+      <PointLight :position="{ x: 0, y: 50, z: 50 }"></PointLight>
+      <Box ref="box" :size="10" :rotation="{ x: 0.5, y: 0.25 }" material="mat1"></Box>
+      <Sphere ref="sphere" :radius="10" :position="{ x: 50 }" material="mat2"></Sphere>
+    </Scene>
+  </Renderer>
+```
+
+## Test
+
+    git clone https://github.com/troisjs/trois
+    cd trois
+    yarn
+    yarn dev