feat(*): Add basic example estimation page

src/components/AverageEstimate.svelte

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+<script lang="ts">
+	export let average: string | number;
+</script>
+
+<div id="average-estimate">
+	<h2>Average Estimate</h2>
+	<p>{average}</p>
+</div>

src/components/EstimateGroupsList.svelte

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+<script lang="ts">
+	export let estimateGroups: any;
+</script>
+
+<div id="estimate-groups-list">
+	<h2>Estimate Groups</h2>
+	<ul>
+		{#each Object.keys(estimateGroups) as estimate}
+			<li>
+				Estimate: {estimate}
+				<ul>
+					{#if estimateGroups[estimate].length >= 5}
+						<li>5+ people</li>
+					{:else}
+						{#each estimateGroups[estimate] as user}
+							<li>{user}</li>
+						{/each}
+					{/if}
+				</ul>
+			</li>
+		{/each}
+	</ul>
+</div>

src/components/UsersList.svelte

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+<script lang="ts">
+	export let estimates: any;
+	export let handleEstimateChange: any;
+</script>
+
+<div id="users-list">
+	<h2>Users</h2>
+	<ul>
+		{#each estimates as user}
+			<li>
+				{user.name}
+				<input
+					type="number"
+					value={user.estimate}
+					on:input={(e) => handleEstimateChange(e, user)}
+				/>
+			</li>
+		{/each}
+	</ul>
+</div>