docs: add pairing challenge

monthly-challenges/pairing/README.md

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+# Pairing
+
+Pairing is more than just coding with someone else. Pairing is about communication, teaching, learning, positive reinforcements, and growing.
+
+> [!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**
+
+TBA
+
+## Async Check-Ins
+
+⏳ **Timeline**: TBA
+
+📃 **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
+
+- [February 2022](https://virtualcoffee.io/monthlychallenges/feb-2022)
+- [December 2020](https://virtualcoffee.io/monthlychallenges/dec-2020)
+
+## Past Blog Posts