add c-lang mentorship info

c-lang.md

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+DnH C Language Group
+---
+
+
+This is a group to study the C Programming Language. We will follow the [Modern C](https://modernc.gforge.inria.fr/) book by Jens Gustedt. We will be focusing on levels 0, 1 and 2 and briefly touching on level 3.
+
+## Goal
+
+Self-directed learning of the C Programming Language over a course of 6-8 weeks with weekly Office Hours on Saturday and Community Mentorship via Slack
+
+## Where?
+
+On Slack, #c-lang channel. Meet over Google Meet - once a week on Saturdays for Office Hours
+
+## How/What?
+
+1. We will meet once every week, typically on Saturday evenings
+2. During the meeting, we will share the chapters & problems from the book to be studied & solved over the upcoming week
+3. You will study the material & solve problems on your own during the upcoming week
+4. During the subsequent, week, we will discuss an clarifications needed and go over material for the upcoming week
+5. go to 1
+
+## Logistics
+
+A rough weekly breakdown of topics we intend to cover is presented below:
+
+| Date          | Chapters       |
+| ------------- |  ------------- |
+| 14th Aug      | 0.1, 0,2       |
+| 21st Aug      | 1.3, 1.4       |
+| 28th Aug      | 1.5, 1.6       |
+| 4th Sep       | 1.7, 1.8       |
+| 11th Sep      | 2.11,2.12,2.13 |
+| 18th Sep      | 2.14,3.15,3.16 |
+| 25th Sep      | 3.17,2.9,2.10  |
+