Add command bar component

source/Component/CommandBar/CommandBar.scss

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+div.command-bar {
+    height: 100%;
+}

source/Component/CommandBar/CommandBar.tsx

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+import { BackgroundLevel, Theme } from "@Component/Theme/Theme";
+import { Component, ReactNode } from "react";
+
+interface ICommandBarProps {
+    width: number;
+}
+
+class CommandBar extends Component<ICommandBarProps> {
+    
+    render(): ReactNode {
+        return <Theme 
+            className="command-bar"
+            backgroundLevel={BackgroundLevel.Level2}
+            style={{ width: this.props.width }}
+        >
+        </Theme>    
+    }
+}
+
+export { CommandBar };