Adding first set of apex-pdp document changes

Adding document changes for auth, context, core, model, services & the
main apex-pdp module.

Change-Id: Id0d026baa258f1dc6998978f9911f3c4a73b5b3b
Issue-ID: POLICY-867
Signed-off-by: ramverma <ram.krishna.verma@ericsson.com>

1 files changed, 31 insertions, 0 deletions

diff --git a/src/site-docs/adoc/fragments/howto-config/introduction.adoc b/src/site-docs/adoc/fragments/howto-config/introduction.adoc
new file mode 100644
index 000000000..3f0265796
--- /dev/null
+++ b/src/site-docs/adoc/fragments/howto-config/introduction.adoc
@@ -0,0 +1,31 @@
+//
+// ============LICENSE_START=======================================================
+//  Copyright (C) 2016-2018 Ericsson. All rights reserved.
+// ================================================================================
+// This file is licensed under the CREATIVE COMMONS ATTRIBUTION 4.0 INTERNATIONAL LICENSE
+// Full license text at https://creativecommons.org/licenses/by/4.0/legalcode
+// 
+// SPDX-License-Identifier: CC-BY-4.0
+// ============LICENSE_END=========================================================
+//
+// @author Sven van der Meer (sven.van.der.meer@ericsson.com)
+//
+
+== Introduction to APEX Configuration
+
+An APEX engine can be configured to use various combinations of
+	event input handlers,
+	event output handlers,
+	event protocols,
+	context handlers, and
+	logic executors.
+The system is build using a plugin architecture.
+Each configuration option is realized by a plugin, which can be loaded and configured when the engine is started.
+New plugins can be added to the system at any time, though to benefit from a new plugin an engine will need to be restarted.
+
+.APEX Configuration Matrix
+image::apex-intro/ApexEngineConfig.png[APEX Configuration Matrix]
+
+The APEX distribution already comes with a number of plugins.
+The figure above shows the provided plugins.
+Any combination of input, output, event protocol, context handlers, and executors is possible.