feat: begin chapter 2HEADmaster

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diff --git a/02/circumference.rs b/02/circumference.rs
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+use std::f64::consts::PI;
+use std::io::stdin;
+
+/// Calculate the area and circumference of a circle from its radius.
+/// 1. Prompt for a radius input.
+/// 2. Parse the input into a numeric radius.
+/// 3. Apply the area and circumference formulas.
+/// 4. Print out the results.
+fn main() {
+    let mut input = String::new();
+    println!("Enter the radius of your circle: ");
+    stdin().read_line(&mut input).expect("No radius given.");
+
+    let radius: f64 = input.trim().parse().expect("Invalid radius given.");
+
+    let circumference = 2.0 * PI * radius;
+    let area = PI * radius.powi(2);
+
+    println!("The circumference is: {circumference}, and the area is: {area}.");
+}
diff --git a/02/readme.md b/02/readme.md
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+---
+author: Adam T. Carpenter, Carpenter Tutoring
+---
+
+# Computational problem solving with _Rust_
+
+## Starting to program
+
+```
+~~~fsays
+Starting to practice!
+~~~
+```
+
+[practice of computing using python](https://www.pearson.com/en-us/subject-catalog/p/practice-of-computing-using-python-the/p200000003329/9780137524839)
+
+[rust book](https://doc.rust-lang.org/book/)
+
+---
+
+# Getting started
+
+We need to dive into language issues in order to work through problem-solving
+issues. Recall:
+
+## 1. Think before you program
+
+## 2. A program is a human-readable essay on problem solving (that also runs on a computer)
+
+---
+
+# Practice!
+
+Learning to experiment is key to learning to program. If you have a question,
+try it out!
+
+Time for a new rule:
+
+## 3. The best way to improve your programming an problem skills is to practice!
+
+---
+
+# Calculate the circumference and area of a circle given its radius
+
+Formulas:
+
+```
+circumference = 2 * π * radius
+area = π * radius ^ 2
+```
+
+Requirements:
+
+1. We need to prompt the user for a radius
+
+TODO:
+
+---
+
+# Calculate the circumference and area of a circle given its radius
+
+```bash
+tmux display-popup 'rustc ./circumference.rs && ./circumference'
+```
+
+```rust
+use std::f64::consts::PI;
+use std::io::stdin;
+
+// Calculate the area and circumference of a circle from its radius.
+// 1. Prompt for a radius input.
+// 2. Parse the input into a numeric radius.
+// 3. Apply the area and circumference formulas.
+// 4. Print out the results.
+fn main() {
+    let mut input = String::new();
+    println!("Enter the radius of your circle: ");
+    stdin().read_line(&mut input).expect("No radius given.");
+
+    let radius: f64 = input.trim().parse().expect("Invalid radius given.");
+
+    let circumference = 2.0 * PI * radius;
+    let area = PI * radius.powi(2);
+
+    println!("The circumference is: {circumference}, and the area is: {area}.");
+}
+```