feat: update lesson 2 and add appendix entry

lessons/2/exercise.ipynb

@@ -0,0 +1,52 @@
+{
+    "cells": [
+        {
+            "cell_type": "markdown",
+            "metadata": {},
+            "source": [
+                "# Exercise 2: Piping commands\n",
+                "\n",
+                "Pipe the first and second columns of `fruits_extended.csv` into `qsv table`."
+            ]
+        },
+        {
+            "cell_type": "code",
+            "execution_count": null,
+            "metadata": {},
+            "outputs": [],
+            "source": [
+                "qsv select --help"
+            ]
+        },
+        {
+            "cell_type": "markdown",
+            "metadata": {},
+            "source": [
+                "After running that pipeline and viewing the output, try adding `qsv transpose` before `qsv table` in the pipeline and see what the output looks like."
+            ]
+        },
+        {
+            "cell_type": "code",
+            "execution_count": null,
+            "metadata": {
+                "vscode": {
+                    "languageId": "plaintext"
+                }
+            },
+            "outputs": [],
+            "source": []
+        }
+    ],
+    "metadata": {
+        "kernelspec": {
+            "display_name": "Bash",
+            "language": "bash",
+            "name": "bash"
+        },
+        "language_info": {
+            "name": "bash"
+        }
+    },
+    "nbformat": 4,
+    "nbformat_minor": 2
+}