Include usage in readme

Author: feildmaster

readme.md

@@ -1,3 +1,82 @@
 # SimpleToast
 
 Small (but powerful) toast library.
+
+## Usage
+
+Text (required):
+
+```javascript
+    SimpleToast('Text');
+    SimpleToast({text: 'Text'});
+```
+
+Title with text:
+
+```javascript
+    SimpleToast({title: 'Title', text: 'Text'});
+```
+
+### CSS
+
+Targets:
+
+* css (or) css.toast: Applies to toast
+* css.title: Applies to title
+* css.button: Applies to buttons
+
+```javascript
+    // Apply a red-ish background
+    SimpleToast({text: 'Text', css: {background: '#c8354e'}});
+
+    SimpleToast({
+        css: {
+            // Applies to toast (unless toast is present)
+            toast: {
+                // Applies to toast
+            },
+            title: {
+                // Applies to title
+            },
+            button: {
+                // Applies to buttons
+                mouseOver: {
+                    // Applies to buttons when moused over
+                }
+            },
+        },
+    });
+```
+
+### Buttons
+
+You can provide a single button within an object, or an array of buttons.
+
+```javascript
+    // Single button
+    SimpleToast({
+        buttons: {
+            text: 'Text', // Required
+            onclick: () => {
+                // Runs on click
+            },
+            css: {
+                // Applies to button
+                mouseOver: {
+                    // Applies to button when moused over
+                },
+            },
+        },
+    });
+    // Multiple Buttons
+    SimpleToast({
+        buttons: [
+            {
+                // Button data goes here
+            },
+            {
+                // Button data goes here
+            },
+        ],
+    });
+```