Added More Base64 Tool (#17982)

I noticed this https://www.base64encode.org/ Tool is not working in the safari browser, So I added alternative tool that I found is working on safari and another browser.

Please Check Link that I added :)

Thanks

Author: rahulkumarsingh73690

content/en/docs/tasks/inject-data-application/distribute-credentials-secure.md

@@ -20,7 +20,7 @@ encryption keys, into Pods.
 ## Convert your secret data to a base-64 representation
 
 Suppose you want to have two pieces of secret data: a username `my-app` and a password
-`39528$vdg7Jb`. First, use [Base64 encoding](https://www.base64encode.org/) to
+`39528$vdg7Jb`. First, use online Base 64 Encoding Tool [Base64 encoding](https://www.base64encode.org/), [Base64 encode](https://goonlinetools.com/base64-encode/) to
 convert your username and password to a base-64 representation. Here's a Linux
 example: