chore: Format welcome message with emojis

[ppruthi]

Related Issues/PRs

None

What changes are proposed in this pull request?

Editing the welcome message posted on new PRs/Issues

How is this patch tested?

Used markdown to preview the text

Does this PR change any dependencies?

• No. You can skip this section.
• Yes. Make sure the dependencies are resolved correctly, and list changes here.

Does this PR add a new feature? If so, have you added samples on website?

• No. You can skip this section.
• Yes. Make sure you have added samples following below steps.

1. Find the corresponding markdown file for your new feature in website/docs/documentation folder.
   Make sure you choose the correct class estimators/transformers and namespace.
2. Follow the pattern in markdown file and add another section for your new API, including pyspark, scala (and .NET potentially) samples.
3. Make sure the DocTable points to correct API link.
4. Navigate to website folder, and run yarn run start to make sure the website renders correctly.
5. Don't forget to add <!--pytest-codeblocks:cont--> before each python code blocks to enable auto-tests for python samples.
6. Make sure the WebsiteSamplesTests job pass in the pipeline.

AB#1893152

[github-actions]

Hey @ppruthi ! Thank you so much for contributing
to our repository. Someone from SynapseML Team will be reviewing this pull request
soon. We appreciate your patience and contributions!

[ppruthi]

/azp run

[azure-pipelines]

Azure Pipelines could not run because the pipeline triggers exclude this branch/path.