4.0.0 (#42)

* adding URL conversions

* updating gotenberg version in documentation

* pkg: input as variadic string (#39)

* pkg: input as variadic string

* pkg: fix link to github doc

* update doc about v4 client

* make doc

* fixing missing variadic inputs in doc

* adding more fonts

* updating PHP documentation

build/docs/content/06-merge.md

@@ -0,0 +1,53 @@
+---
+title: Merge
+---
+
+Gotenberg provides the endpoint `/merge` for merging PDFs.
+
+It accepts `POST` requests with a `multipart/form-data` Content-Type.
+
+## Basic
+
+Nothing special here: you may send one or more PDF files and the API
+will merge them and return the resulting PDF file.
+
+### cURL
+
+```bash
+$ curl --request POST \
+    --url http://localhost:3000/merge \
+    --header 'Content-Type: multipart/form-data' \
+    --form files=@file.pdf \
+    --form files=@file2.pdf \
+    -o result.pdf
+```
+
+### Go
+
+```golang
+import "github.com/thecodingmachine/gotenberg/pkg"
+
+func main() {
+    c := &gotenberg.Client{Hostname: "http://localhost:3000"}
+    req, _ := gotenberg.NewMergeRequest("file.pdf", "file2.pdf")
+    dest := "result.pdf"
+    c.Store(req, dest)
+}
+```
+
+### PHP
+
+```php
+use TheCodingMachine\Gotenberg\Client;
+use TheCodingMachine\Gotenberg\DocumentFactory;
+use TheCodingMachine\Gotenberg\MergeRequest;
+
+$client = new Client('http://localhost:3000', new \Http\Adapter\Guzzle6\Client());
+$files = [
+    DocumentFactory::makeFromPath('file.pdf', 'file.pdf'),
+    DocumentFactory::makeFromPath('file2.pdf', 'file2.pdf'),
+];
+$request = new MergeRequest($files);
+$dest = "result.pdf";
+$filename = $client->store($request, $dest);
+```