Add basic Vencord injection

src/preload/index.ts

@@ -1 +1,18 @@
-console.log("banana");
+import { ipcRenderer, webFrame } from "electron";
+import { GET_VENCORD } from "../shared/IpcEvents";
+
+const { js, css } = ipcRenderer.sendSync(GET_VENCORD);
+
+webFrame.executeJavaScript(js);
+
+const style = document.createElement("style");
+style.id = "vencord-css-core";
+style.textContent = css;
+
+if (document.readyState === "complete") {
+    document.documentElement.appendChild(style);
+} else {
+    document.addEventListener("DOMContentLoaded", () => document.documentElement.appendChild(style), {
+        once: true
+    });
+}