Fix for pm (#7)

* fix: update sample dialog to use proper commands

* feat: can now add custom commands

README.md

@@ -86,6 +86,38 @@ Functions are units of code that Yarn scripts can call to receive a value.
 | item_count   | item_count(itemName)        | Returns the number of the given item the player has.                             |
 | random_range | random_range(min, max)      | Given a min and max, return a random number between them.                        |
 
+## How to add custom commands?
+This plugin was designed to be easily extensible.  Let's say you'd like to add a new command
+named `custom_hello`.  Not only that, but we also want it to accept a parameter of WHO to say
+hello to.  Here's how you'd do it:
+
+First, create your Yarn dialog file, exactly as you'd like it to be.
+
+```yarn
+title: SampleNode
+---
+Whatever other things you want to have happen.
+<<custom_hello george>>
+Other things...
+===
+```
+Notice that "custom_hello" by default won't work, as that's not one of the commands built into
+this plugin.  So, let's add it.
+
+Using a "script" in the event editor, or via your own plugins javascript code, add the following:
+```js
+const customGreeter = (_callingEventId, name) => {console.log("Hi " + name + "!")};
+if (!pixelmapYarnSpinner.commands.get('custom_hello')) {
+  pixelmapYarnSpinner.addCommand('custom_hello', customGreeter);
+}
+```
+
+The important part here is the `pixelmapYarnSpinner.addCommand` call.  This is how you add a
+new command to the plugin.  The first parameter is the name of the command, and the second is
+the function that will be called when the command is encountered in the Yarn dialog.  The function
+will be passed the calling event ID, followed by any parameters that were passed to the command.
+
+Provided this is invoked BEFORE the Yarn dialog is loaded, the command will be available to use.
 
 ## Credits
 

build.js

@@ -5,6 +5,7 @@ generate('src/metadata.yaml').then((header) => {
   require('esbuild')
     .build({
       logLevel: 'info',
+      globalName: 'pixelmapYarnSpinner',
       entryPoints: ['src/index.ts'],
       bundle: true,
       sourcemap: true,

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