update readme

README.md

@@ -19,13 +19,29 @@ Create a Virtual Environment:
 
 Activate the Virtual Environment:
 
+* On macOS and Linux:
+
+        source bin/activate
+
 * On Windows:
 
         .\Scripts\activate
 
-* On macOS and Linux:
 
-        source bin/activate
+
+Install Imagemagick:
+
+* On macOS: 
+* Install HomeBrew:
+
+    /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
+
+* Install Imagemagick:
+
+    brew install imagemagick
+
+
+* On Windows: [follow this](https://imagemagick.org/script/install-source.php)
 
 Install Dependencies:
 
@@ -54,6 +70,10 @@ Test it running un a Local Server:
 
 Open a web browser and go to http://localhost:8000 to view your digital garden.
 
+## UPDATE YOUR WEBSITE!
+
+If you add or remove contents from your folders or if you edit the config.json file, you have to relaunch the app.py script in order to update the generated code.
+
 ## PUT IT ONLINE!
 
 Just add the whole 'website/' folder in your server.