docs: Add "Mid-Year Check-In" challenge

monthly-challenges/mid-year-check-in/README.md

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+# Mid-Year Check-In
+
+The Mid-Year Check-In challenge is designed to provide an opportunity for Virtual Coffee members to reflect on their progress, reevaluate goals, and gain clarity on their journey. This challenge aims to encourage personal growth, foster connection within the community, and provide a supportive space for members to share their insights, challenges, and successes.
+
+> [!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**
+
+TBA
+
+## Async Check-Ins
+
+⏳ **Timeline**: Fridays, 9:00 AM ET.
+
+📃 **Script Templates**
+
+TBA
+
+## Slack Channels
+
+Slack channels that we use for the challenge:
+
+- `#announcement`
+  - Initial announcement.
+- `#monthly-challenge`
+  - Challenge announcements.
+  - Async check-ins.
+
+---
+
+## Past Challenges
+
+- [June 2024](https://virtualcoffee.io/monthlychallenges/june-2024)
+- June 2023
+
+## Past Blog Posts
+
+- **2024**: [Monthly Challenge: Mid-Year Check-In — Recharge and Refocus for an Amazing Second Half!](https://dev.to/virtualcoffee/monthly-challenge-mid-year-check-in-recharge-and-refocus-for-an-amazing-second-half-2k4c)
+- **2023**: [Join Virtual Coffee for the Mid-Year Check-In Challenge: Reflect, Reevaluate, and Grow!](https://dev.to/virtualcoffee/join-virtual-coffee-for-the-mid-year-check-in-challenge-reflect-reevaluate-and-grow-3npk)