docs: Add "Welcoming Community" challenge

monthly-challenges/welcoming-community/README.md

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+# Welcoming Community
+
+This challenge allows Virtual Coffee members to invite a friend to join our community. However, simply inviting someone is not enough! We encourage everyone to warmly welcome and support our new friends and demonstrate what Virtual Coffee is truly all about - a welcoming and supportive community!
+
+> [!TIP]
+> Read our [`facilitator-docs.md`](../facilitators-docs.md) to learn how to handle tasks before and after challenges, as well as the technical guidelines.
+
+## Announcement to Kick-Off the Challenge
+
+📃 **Script Templates**
+
+**2024**
+
+```text
+It’s now July and we are pleased to announce a new challenge: Welcoming Community! As part of this challenge, every one of you will be able to invite one new member during the month of July.
+
+During this month, we're also encouraging you to actively welcome our new members and show them what Virtual Coffee is all about. A welcoming and supportive community. 💖
+
+You can check out the full challenge details here.
+
+Read @Ayu's blogpost here.
+```
+
+## Async Check-Ins
+
+⏳ **Timeline**: Fridays, noon ET.
+
+📃 **Script Templates**
+
+- **Week 1**
+
+  ```text
+  Hi friends! As we reach the end of the first week of the Welcoming Community challenge, has anyone used their Challenge invite yet? If not, make sure to send the waiting list link to someone with the instructions in my last post on how to fill out the form to get their special invite!
+  ```
+
+- **Week 2**
+
+  ```text
+  Hi friends! As the second week of July draws to a close, how are you getting on with Welcoming Community?
+
+  Don't forget, **every member** of Virtual Coffee can invite one new person this month. See the instructions further up in this channel for how to do so!
+
+  New members who joined during July, you too can invite one new person, there's no minimum membership time! 💖
+  ```
+
+- **Week 3**
+
+  ```text
+  Hi friends!
+
+  Who's used their new member invite this week? Have you encouraged your invitee to post in the #welcome channel so the community can welcome them? What else have y'all been doing for Welcoming Community? What do you plan to do next week?
+  ```
+
+- **Week 4**
+
+  ```text
+  Hi friends!
+
+  Who's used their new member invite this week? We're getting into the final week of Welcoming Community, so if you haven't used yours yet, time is running out. Remember, new members who joined this month, you too can invite one person during July.
+
+  What have you done to welcome new members this week? What do you intend to do next week?
+  ```
+
+## Slack Channels
+
+Slack channels that we use for the challenge:
+
+- `#announcement`
+  - Initial announcement.
+- `#monthly-challenge`
+  - Challenge announcements.
+  - Async check-ins.
+- `#welcome`
+  - Welcoming new members.
+
+---
+
+## Past Challenges
+
+- [July 2024](https://virtualcoffee.io/monthlychallenges/july-2024)
+
+## Past Blog Posts
+
+- **2024**: [Monthly Challenge: Welcoming Community!](https://dev.to/virtualcoffee/monthly-challenge-welcoming-community-4d44)