Created Allure Plugin

Signed-off-by: Deepak Bhardwaj <deepak.bhardwaj@outlook.com>

plugins/allure/README.md

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+# Allure
+
+Welcome to the Backstage Allure plugin. This plugin add an entity service page to display Allure test reports related to the service.
+
+## Install
+
+Run the below command from the `app` package directory.
+
+```shell
+yarn add @backstage/plugin-allure
+```
+
+alternatively, you can execute below command from the root directory of your Backstage app.
+
+```shell
+yarn workspace app add @backstage/plugin-allure
+```
+
+## Configure
+
+### Configure Allure service
+
+Add below configuration in the `app-config.yaml`.
+
+```yaml
+allure:
+  baseUrl: <ALLURE_SERVICE_BASE_URL> # Example: http://localhost:5050/allure-docker-service
+```
+
+### Setup entity service page
+
+Add `EntityAllureReportContent` in the `EntityPage.tsx` like below:
+
+```diff
++ import { EntityAllureReportContent } from '@backstage/plugin-allure';
+
+...
+
+const serviceEntityPage = (
+  <EntityLayoutWrapper>
+    ...
++    <EntityLayout.Route path="/allure" title="Allure Report">
++        <EntityAllureReportContent />
++    </EntityLayout.Route>
+  </EntityLayoutWrapper>
+);
+```