add a preview and make a better readme

README.md

@@ -1,4 +1,13 @@
 # MMM - Mediocre Macro Manager
 #### Perfect for all of your ~~ponzi scheme~~ macro needs!
 
-Tip: You can chain macros by including macros above it in the expansion.
+# What does this do?
+This is a simple plugin that allows you to turn a prefixed command into some expansion. For example `^macro` turns into
+```
+hello from the macro!
+```
+
+Tip: You can chain macros by including macros located above it in the macro list in the expansion.
+
+# Preview
+![A preview of the MMM plugin functionality](assets/mmm_preview.gif)

manifest.json

@@ -1,7 +1,7 @@
 {
   "id": "com.twoexem.delta.MMM",
   "name": "MMM",
-  "description": "Mediocre Macro Manager",
+  "description": "A simple plugin that allows you to turn a prefixed command into some expansion.",
   "author": {
     "name": "delta",
     "discordID": "770804101332074547",