Add concordance list for loan type names

src/MDConcLoanTypes.php

@@ -0,0 +1,24 @@
+<?PHP
+/**
+ * Constains lists for categorizing loan types.
+ *
+ * @author Joshua Ramon Enslin <joshua@museum-digital.de>
+ */
+declare(strict_types = 1);
+
+/**
+ * Provides a list for finding the loan type for an input.
+ */
+final class MDConcLoanTypes {
+
+    const LOAN_TYPES = [
+
+        // Outgoing
+        "ausgehend" => "outgoing",
+
+        // Incoming
+        "eingehend" => "incoming",
+
+    ];
+
+}