pdfcpu & wasm update, server side functions init, README.md, CONTRIBUTE.md

functions/rotatePDF.js

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+import { PDFDocument, ParseSpeeds } from 'pdf-lib'
+
+export const rotatePages = async (snapshot, rotation) => {
+    // Load the original PDF file
+    const pdfDoc = await PDFDocument.load(snapshot, {
+        parseSpeed: ParseSpeeds.Fastest,
+    });
+
+    const pages = pdfDoc.getPages();
+
+    pages.forEach(page => {
+        // Change page size
+        page.setRotation(degrees(rotation))
+    });
+
+    // Serialize the modified document
+    return pdfDoc.save();
+};