Replace generator-exercise with plop generator

generators/writeReadme.js

@@ -0,0 +1,14 @@
+const { writeFile } = require("fs/promises");
+const { join } = require("path");
+const { splitDirectoryName } = require("./helpers");
+
+async function writeReadme(exercisePath) {
+  const { exerciseNumber, exerciseName } = splitDirectoryName(exercisePath);
+  const readmeContent = `# Exercise ${exerciseNumber} - ${exerciseName}
+
+Description of the exercise goes here.`;
+
+  await writeFile(join(exercisePath, "README.md"), readmeContent);
+}
+
+module.exports = { writeReadme };