C#: Add Customizations.qll

Author: hvitved

csharp/ql/src/Customizations.qll

@@ -0,0 +1,12 @@
+/**
+ * Contains customizations to the standard library.
+ *
+ * This module is imported by `csharp.qll`, so any customizations defined here automatically
+ * apply to all queries.
+ *
+ * Typical examples of customizations include adding new subclasses of abstract classes such as
+ * the `RemoteFlowSource` and `SummarizedCallable` classes associated with the security queries
+ * to model frameworks that are not covered by the standard library.
+ */
+
+import csharp

csharp/ql/src/csharp.qll

@@ -2,6 +2,7 @@
  * The default C# QL library.
  */
 
+import Customizations
 import semmle.code.csharp.Attribute
 import semmle.code.csharp.Callable
 import semmle.code.csharp.Comments