Created Connect 4 with sample projects

A fun intermediate project that can blow minds while working on it.

Projects/2-Intermediate/Connect four.md

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+# Connect Four
+
+**Tier:** 2-Intermediate
+
+It is an Interactive two-player game that helps develop analytical and lateral thinking skills in which the players choose a color and then take turns dropping colored discs into a seven-column, six-row vertically suspended grid. 
+The pieces fall straight down, occupying the lowest available space within the column. 
+The objective of the game is to be the first to form a horizontal, vertical, or diagonal line of four of one's own discs.
+
+## User Stories
+
+- [ ] User can pick a color.
+- [ ] User chooses which column to input. This can be made with the help of button views or touch views.
+- [ ] The user that wins the game, gets to start the next.
+
+## Bonus features
+
+- [ ] Have an authentication sign up / sign in system that helps track multiple users.
+- [ ] Create a computer player which can intelligently tackle and win the game against the human player.
+
+## Useful links and resources
+
+- [Connect Four](https://connect-4.org/) for a working sample of the game.
+
+## Example projects
+
+- [Connect Four Game in Python](https://github.com/KeithGalli/Connect4-Python)