Add container with two columns

public/typo3conf/ext/ep_theme/Configuration/TypoScript/ContentElements/container.typoscript

@@ -1,3 +1,14 @@
+tt_content.ep_container_halves =< lib.contentElement
+tt_content.ep_container_halves {
+    templateName = Halves
+    templateRootPaths {
+        10 = EXT:ep_theme/Resources/Private/Templates/Container
+    }
+    dataProcessing {
+        100 = B13\Container\DataProcessing\ContainerProcessor
+    }
+}
+
 tt_content.ep_container_thirds =< lib.contentElement
 tt_content.ep_container_thirds {
     templateName = Thirds