Add assignment 2 skeleton

scripts/grade-02.sh

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+#!/usr/bin/env bash
+
+set -e
+set -uo pipefail
+IFS=$'\n\t'
+
+# Imports library.
+BASEDIR=$(dirname "$0")
+source $BASEDIR/grade-utils.sh
+
+RUNNERS=(
+    "cargo"
+    "cargo --release"
+    "cargo_asan"
+    "cargo_asan --release"
+    "cargo_tsan"
+    "cargo_tsan --release"
+)
+
+# Lints.
+cargo fmt --check
+cargo clippy
+
+# Executes test for each runner.
+for RUNNER in "${RUNNERS[@]}"; do
+    echo "Running with $RUNNER..."
+
+    TESTS=("--lib assignment02_grade")
+    if [ $(run_tests) -ne 0 ]; then
+        exit 1
+    fi
+done
+
+exit 0

src/assignments/assignment02.rs

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+//! Assignment 2: Mastering common programming concepts (1/2).
+
+// TODO: use exercises in <https://doc.rust-lang.org/book/ch03-05-control-flow.html>

src/assignments/assignment02_grade.rs

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+#[cfg(test)]
+mod test {
+    use super::super::assignment02::*;
+}