add vitepress docs

docs/demos/bottom-popup/basic.vue

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+<template>
+	<div class="demo">
+		<button type="button" class="btn" @click="visible = true" v-text="'打开底部弹层'" />
+
+		<p class="status" v-text="`最近一次操作：${lastAction}`" />
+
+		<bottom-popup
+			v-model="visible"
+			title="选择操作"
+			left-button-text="取消"
+			right-button-text="确定"
+			@left-button-click="onCancel"
+			@right-button-click="onConfirm"
+		>
+			<div class="content">
+				<p v-text="'弹层从视口底部升起，默认带遮罩，内容区可滚动。'" />
+				<p v-text="'标题栏在内容滚动时会吸顶。'" />
+			</div>
+		</bottom-popup>
+	</div>
+</template>
+
+<script lang="ts" setup>
+import { ref } from "vue";
+import { BottomPopup } from "timi-tdesign-mobile";
+
+const visible = ref(false);
+const lastAction = ref("无");
+
+/** 左右按钮只抛事件，关闭与否由业务决定——这里两者都关闭。 */
+function onCancel() {
+	visible.value = false;
+	lastAction.value = "取消";
+}
+
+function onConfirm() {
+	visible.value = false;
+	lastAction.value = "确定";
+}
+</script>
+
+<style lang="less" scoped>
+.demo {
+	.btn {
+		width: 100%;
+		padding: .625rem;
+		font-size: .875rem;
+		cursor: pointer;
+		border: none;
+		border-radius: .5rem;
+		color: #fff;
+		background: var(--vp-c-brand-1);
+	}
+
+	.status {
+		margin: .75rem 0 0;
+		font-size: .75rem;
+		color: var(--vp-c-text-2);
+	}
+
+	.content {
+		padding: 1rem;
+
+		p {
+			margin: 0 0 .75rem;
+			font-size: .8125rem;
+			line-height: 1.6;
+			color: var(--vp-c-text-2);
+
+			&:last-child {
+				margin-bottom: 0;
+			}
+		}
+	}
+}
+</style>