add python extension docs

docs/day0.md

@@ -68,6 +68,30 @@ Your most important tool as a programmer is a proper editor. It should offer you
 
     ![kill_terminal](img/day0/kill_terminal.png)
 
+1. Click the "extensions" button on the left to open the extensions page
+
+    ![extension](img/day0/extension.png)
+
+1. Search for "python"
+
+    ![search_python](img/day0/search_python.png)
+
+1. Click on the first Python extension and click "install"
+
+    ![install_python](img/day0/install_python.png)
+
+1. When the extension has finished installing, close out of the welcome window
+
+    ![close_welcome](img/day0/close_welcome.png)
+
+1. Close out of the extension window
+
+    ![close_extension](img/day0/close_extension.png)
+
+1. Reopen your document view by clicking the "documents" icon
+
+    ![select_docs](img/day0/select_docs.png)
+
 ### Create a "Projects" folder
 
 I keep all my projects in a folder called "Projects" in my home directory. On Windows this is at `C:\Users\username\Projects`. Create this folder now. Bookmark it, put it in your favorites, don't lose it.
@@ -160,24 +184,48 @@ Your most important tool as a programmer is a proper editor. It should offer you
 
 1. Head to <https://code.visualstudio.com/>
 
-2. Click on the download link
+1. Click on the download link
 
     ![vscode_download](img/day0/code_download.png)
 
-3. Run through the installer, select default options
+1. Run through the installer, select default options
 
-4. Open VSCode
+1. Open VSCode
 
     ![vscode_open](img/day0/vscode_open.png)
 
-5. Uncheck "Show welcome page on startup"
+1. Uncheck "Show welcome page on startup"
 
     ![vscode_uncheck](img/day0/vscode_uncheck.gif)
 
-6. Close out of the welcome page
+1. Close out of the welcome page
 
     ![close_welcome](img/day0/close_welcome.gif)
 
+1. Click the "extensions" button on the left to open the extensions page
+
+    ![extension](img/day0/extension.png)
+
+1. Search for "python"
+
+    ![search_python](img/day0/search_python.png)
+
+1. Click on the first Python extension and click "install"
+
+    ![install_python](img/day0/install_python.png)
+
+1. When the extension has finished installing, close out of the welcome window
+
+    ![close_welcome](img/day0/close_welcome.png)
+
+1. Close out of the extension window
+
+    ![close_extension](img/day0/close_extension.png)
+
+1. Reopen your document view by clicking the "documents" icon
+
+    ![select_docs](img/day0/select_docs.png)
+
 ### Create a "Projects" folder
 
 I keep all my projects in a folder called "Projects" in my home directory. On MacOS this is at `/Users/username/Projects`. Create this folder now. Bookmark it, put it in your favorites, don't lose it.