add timble-one/backend-bundle (#1951)

Co-authored-by: Timo Bühlmann <info@timble.one>

timble-one/backend-bundle/0.1/manifest.json

@@ -0,0 +1,8 @@
+{
+    "bundles": {
+        "TimbleOne\\BackendBundle\\BackendBundle": ["all"]
+    },
+    "dockerfile": [
+        "RUN install-php-extensions gd exif"
+    ]
+}

timble-one/backend-bundle/0.1/post-install.txt

@@ -0,0 +1,16 @@
+<bg=blue;fg=white>                         </>
+<bg=blue;fg=white> TimbleOne BackendBundle </>
+<bg=blue;fg=white>                         </>
+
+This bundle requires the PHP extensions <comment>gd</> and <comment>exif</>.
+
+If your project uses Symfony Docker and has a root <comment>Dockerfile</> with:
+  <comment>###> recipes ###</>
+  <comment>###< recipes ###</>
+then Symfony Flex will add:
+  <comment>RUN install-php-extensions gd exif</>
+
+If you don't use Docker, install these PHP extensions on your machine/server
+and restart PHP-FPM / your web server afterwards.
+
+Composer will fail with a clear error until <comment>ext-gd</> and <comment>ext-exif</> are available.