Add The Missing Semester

Resolves #678

README.md

@@ -89,6 +89,7 @@ just remember that you can't purchase success!
 - [Intro CS](#intro-cs)
   - [Introduction to Programming](#introduction-to-programming)
   - [Introduction to Computer Science](#introduction-to-computer-science)
+  - [Introduction to CS Tools](#introduction-to-cs-tools)
 - [Core CS](#core-cs)
   - [Core programming](#core-programming)
   - [Core math](#core-math)
@@ -147,6 +148,21 @@ Courses | Duration | Effort | Prerequisites
 :-- | :--: | :--: | :--:
 [Introduction to Computer Science and Programming using Python](https://www.edx.org/course/introduction-computer-science-mitx-6-00-1x-10) ([alt](https://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-0001-introduction-to-computer-science-and-programming-in-python-fall-2016/)) | 9 weeks | 15 hours/week | [high school algebra](https://www.khanacademy.org/math/algebra-home)
 
+### Introduction to CS Tools
+Understanding theory is important, but you will also be expected to create programs. There are a number of tools that are widely used to make that process easier. Learn them now to ease your future work writing programs.
+
+**Topics covered**:
+`terminals and shell scripting`
+`vim`
+`command line environments`
+`version control`
+`and more`
+
+Courses | Duration | Effort | Prerequisites
+:-- | :--: | :--: | :--:
+[The Missing Semester of Your CS Education](https://missing.csail.mit.edu/) | 2 weeks | 12 hours/week | -
+
+
 ## Core CS
 
 All coursework under Core CS is **required**, unless otherwise indicated.