Add Exams section and Writing Exams page

exams/index.md

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+---
+layout: page
+title: Exams
+nav_order: 3
+has_children: true
+---
+
+# Exams
+
+## Quick Links
+
+- [CS 161 Pedagogy Blog: How to Write Solid Exam Questions](https://pedagogy.cs161.org/2022/02/06/exam-writing-i/) 

exams/writing-exams.md

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+---
+layout: page
+title: Tools for Writing Exams
+parent: Exams
+nav_order: 1
+---
+
+# Tools for Writing Exams
+
+Many tools have been used over the years for writing exams, including:
+
+- Latex, typically using [Overleaf](https://www.overleaf.com/) for its in-browser editor, compiler, and previewer and its collaboration features
+- CS 61A's [examtool](https://pypi.org/project/examtool/) which is a combination of tools:
+    - The now deprecated examtool web app which allowed students to take exams online
+    - The examtool CLI which allows instructors/TAs to compile exams from .md and .tex files to PDF
+    - The examtool Markdown syntax
+- [PrairieLearn](https://www.prairielearn.com/)
+- Most recently, [Typst](https://typst.app/), a Latex and Overleaf alternative, has been gaining popularity for its in-browser editor, compiler, and previewer and its local features
+    - CS 61C has a Typst exam template [61c-examst](https://github.com/61c-teach/cs61c-examst) developed by Andrew Liu (liu.andrew@)
+