Add link to gitlab REAME.md page

At the moment the link is hard coded to the component.

src/PointMap.js

@@ -236,6 +236,26 @@ class PointMap extends Component {
     );
   }
 
+  getMoreInfoLink() {
+    const styles = {
+      container: {
+        position: "absolute",
+        zIndex: 10,
+        top: "94%",
+      },
+    };
+    return (
+      <div style={styles.container}>
+        <Button
+          href="https://gitlab.labranet.jamk.fi/data-analysis-and-ai/lam-station-visualization/blob/master/README.md"
+          size="large"
+        >
+          More Info
+        </Button>
+      </div>
+    );
+  }
+
   render() {
     const point_coords = this.props.points.toArray();
     const layers = [
@@ -291,6 +311,7 @@ class PointMap extends Component {
         }
         {this.getColorInfo(color_spectrum, undef_color)}
         {this.getTips()}
+        {this.getMoreInfoLink()}
       </div>
     );
   }