Add A.1 and A.2 solutions (#198)

* add A.1 and A.2 solutions

* fix links

appendix-A/01_main-chapter-code/exercise-solutions.ipynb

@@ -19,6 +19,34 @@
     "</table>\n"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Exercise A.1"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "The [Python Setup Tips](../../setup/01_optional-python-setup-preferences/README.md) document in this repository contains additional recommendations and tips to set up your Python environment.\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Exercise A.2"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "The [Installing Libraries Used In This Book document](../../setup/02_installing-python-libraries/README.md) and [directory](../../setup/02_installing-python-libraries/) contains utilities to check whether your environment is set up correctly."
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},
@@ -154,15 +182,6 @@
    "source": [
     "%timeit a @ b"
    ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "metadata": {
-    "id": "Zqqa-To2L749"
-   },
-   "outputs": [],
-   "source": []
   }
  ],
  "metadata": {
@@ -187,7 +206,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.11.4"
+   "version": "3.10.6"
   }
  },
  "nbformat": 4,