Implement query copilot UI (#1452)

src/Explorer/SplashScreen/SplashScreenButton.tsx

@@ -0,0 +1,50 @@
+import { Stack, Text } from "@fluentui/react";
+import React from "react";
+import { KeyCodes } from "../../Common/Constants";
+
+interface SplashScreenButtonProps {
+  imgSrc: string;
+  title: string;
+  description: string;
+  onClick: () => void;
+}
+
+export const SplashScreenButton: React.FC<SplashScreenButtonProps> = ({
+  imgSrc,
+  title,
+  description,
+  onClick,
+}: SplashScreenButtonProps): JSX.Element => {
+  return (
+    <Stack
+      horizontal
+      style={{
+        border: "1px solid #949494",
+        boxSizing: "border-box",
+        boxShadow: "0 4px 4px rgba(0, 0, 0, 0.25)",
+        borderRadius: 4,
+        padding: "32px 16px",
+        backgroundColor: "#ffffff",
+        width: "100%",
+        minHeight: 150,
+      }}
+      onClick={onClick}
+      onKeyPress={(event: React.KeyboardEvent) => {
+        if (event.charCode === KeyCodes.Space || event.charCode === KeyCodes.Enter) {
+          onClick();
+          event.stopPropagation();
+        }
+      }}
+      tabIndex={0}
+      role="button"
+    >
+      <div>
+        <img src={imgSrc} />
+      </div>
+      <Stack style={{ marginLeft: 16 }}>
+        <Text style={{ fontSize: 18, fontWeight: 600 }}>{title}</Text>
+        <Text style={{ fontSize: 13 }}>{description}</Text>
+      </Stack>
+    </Stack>
+  );
+};