Jenkins Plugin: Readme.md file updated (#2943)

* Readme.md file updated

The documentation was not concise and does not include the case if I don't want to use env variables.

* Prettier invoked.

Executed prettier command.

Co-authored-by: Amit Khuraba <amit.khurana@africa.airtel.com>

plugins/jenkins/README.md

@@ -33,7 +33,7 @@ proxy:
         $env: JENKINS_BASIC_AUTH_HEADER
 ```
 
-4. Add an environment variable which contains the Jenkins credentials, (note: use an API token not your password)
+4. Add an environment variable which contains the Jenkins credentials, (note: use an API token not your password). Here user is the name of the user created in Jenkins.
 
 ```shell
 HEADER=$(echo -n user:api-token | base64)
@@ -61,6 +61,21 @@ spec:
 
 8. Click the component in the catalog you should now see Jenkins builds, and a last build result for your master build.
 
+Note:
+
+If you are not using environment variable then you can directly type API token in app-config.yaml
+
+```yaml
+proxy:
+  '/jenkins/api':
+    target: 'http://localhost:8080' # your Jenkins URL
+    changeOrigin: true
+    headers:
+      Authorization: Basic YWRtaW46MTFlYzI1NmU0Mzg1MDFjM2Y1Yzc2Yjc1MWE3ZTQ3YWY4Mw==
+```
+
+YWRtaW46MTFlYzI1NmU0Mzg1MDFjM2Y1Yzc2Yjc1MWE3ZTQ3YWY4Mw== is the base64 of user and it's API token e.g. admin:11ec256e438501c3f5c76b751a7e47af83
+
 ## Features
 
 - View all runs inside a folder