Added support for acknowledging code of conduct for using public Notebook Gallery (#117)

* minro code edits

* Added support for acknowledging code of conduct

- Added CodeOfConduct component that shows links and a checkbox that must be acknwledged before seeing the public galley
- Added verbose message for notebook publish error (when another notebook with the same name exists in the gallery)
- Added a feature flag for enabling code of conduct acknowledgement

* Added Info Component

* minor edit

* fixed failign tests

* publish tab displayed only when code of conduct accepted

* added code of conduct fetch during publish

* fixed bug

* added test and addressed PR comments

* changed line endings

* added comment

* addressed PR comments

src/Explorer/Controls/NotebookGallery/InfoComponent/InfoComponent.tsx

@@ -0,0 +1,42 @@
+import * as React from "react";
+import { Icon, Label, Stack, HoverCard, HoverCardType, Link } from "office-ui-fabric-react";
+import { CodeOfConductEndpoints } from "../../../../Common/Constants";
+import "./InfoComponent.less";
+
+export class InfoComponent extends React.Component {
+  private getInfoPanel = (iconName: string, labelText: string, url: string): JSX.Element => {
+    return (
+      <Link href={url} target="_blank">
+        <div className="infoPanel">
+          <Icon iconName={iconName} styles={{ root: { verticalAlign: "middle" } }} />
+          <Label className="infoLabel">{labelText}</Label>
+        </div>
+      </Link>
+    );
+  };
+
+  private onHover = (): JSX.Element => {
+    return (
+      <Stack tokens={{ childrenGap: 5, padding: 5 }}>
+        <Stack.Item>{this.getInfoPanel("Script", "Code of Conduct", CodeOfConductEndpoints.codeOfConduct)}</Stack.Item>
+        <Stack.Item>
+          {this.getInfoPanel("RedEye", "Privacy Statement", CodeOfConductEndpoints.privacyStatement)}
+        </Stack.Item>
+        <Stack.Item>
+          {this.getInfoPanel("KnowledgeArticle", "Microsoft Terms of Use", CodeOfConductEndpoints.termsOfUse)}
+        </Stack.Item>
+      </Stack>
+    );
+  };
+
+  public render(): JSX.Element {
+    return (
+      <HoverCard plainCardProps={{ onRenderPlainCard: this.onHover }} instantOpenOnClick type={HoverCardType.plain}>
+        <div className="infoPanelMain">
+          <Icon className="infoIconMain" iconName="Help" styles={{ root: { verticalAlign: "middle" } }} />
+          <Label className="infoLabelMain">Help</Label>
+        </div>
+      </HoverCard>
+    );
+  }
+}