Set up Discussions forum for this repo

[sharon-wang]

Currently, we have a Discord server in case anyone wants to get a hold of us. However, having a discussion board right in our repo might be a better place for conversation and sits right next to our code, issues and pull requests.

Let's draft a "welcome" post (General category) to introduce visitors to our discussion board and point them to useful links/resources for the Akita project, such as:

• how to open an issue
• contributing guidelines
• https://dev.to/esse-dev
• https://github.com/esse-dev/a-web-monetization-story

This is the provided template:

<!--
    ✏️ Optional: Customize the content below to let your community know what you intend to use Discussions for.
-->
## 👋 Welcome!
  We’re using Discussions as a place to connect with other members of our community. We hope that you:
  * Ask questions you’re wondering about.
  * Share ideas.
  * Engage with other community members.
  * Welcome others and are open-minded. Remember that this is a community we
  build together 💪.

  To get started, comment below with an introduction of yourself and tell us about what you do with this community.

<!--
  For the maintainers, here are some tips 💡 for getting started with Discussions. We'll leave these in Markdown comments for now, but feel free to take out the comments for all maintainers to see.

  📢 **Announce to your community** that Discussions is available! Go ahead and send that tweet, post, or link it from the website to drive traffic here.

  🔗 If you use issue templates, **link any relevant issue templates** such as questions and community conversations to Discussions. Declutter your issues by driving community content to where they belong in Discussions. If you need help, here's a [link to the documentation](https://docs.github.com/en/github/building-a-strong-community/configuring-issue-templates-for-your-repository#configuring-the-template-chooser).

  ➡️ You can **convert issues to discussions** either individually or bulk by labels. Looking at you, issues labeled “question” or “discussion”.
-->