add category page

Signed-off-by: nurRiyad <asadnurriyad@gmail.com>

pages/category/[topic].vue

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+<template>
+  <div>
+    <h1>This is the {{ $route.params.topic }}</h1>
+  </div>
+</template>

pages/category/index.vue

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+<template>
+  <div>
+    <h1 class="text-5xl">All the topic will be here</h1>
+  </div>
+</template>