add README

Author: WebFreak001

README.md

@@ -0,0 +1,32 @@
+# code-d-api
+
+Extend `code-d` in vscode with custom features.
+
+This API provides:
+
+- support for registering custom snippets depending on installed APIs
+
+## Usage
+
+Add code-d as dependency to your vscode extension inside the package.json:
+
+```js
+"extensionDependencies": ["webfreak.code-d"]
+```
+
+To use, simply get the extension using this code:
+```ts
+import * from "code-d-api";
+
+export function activate(context: vscode.ExtensionContext) {
+	const api: coded.CodedAPI | undefined;
+	const codedExtension = vscode.extensions.getExtension<coded.CodedAPI>(coded.codedExtensionId);
+	if (codedExtension) {
+		api = codedExtension.exports;
+
+		// do your API stuff
+	}
+}
+```
+
+If you only want to optionally depend on code-d, make sure you use the `.activate()` call instead of `.exports` and await it or use it with a `.then(() => {})` clause.