Added chapter Relationship to Other Specifications

Signed-off-by: thadumi <th.theodor.th@gmail.com>

spec/src/main/asciidoc/chapters/relationship_to_other_specifications.adoc

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+*******************************************************************
+* Copyright (c) 2019 Eclipse Foundation
+*
+* This specification document is made available under the terms
+* of the Eclipse Foundation Specification License v1.0, which is
+* available at https://www.eclipse.org/legal/efsl.php.
+*******************************************************************
+////
+
+[[relationship_to_other_specifications]]
+== Relationship to Other Specifications
+
+The Jakarta EE Platform specification requires
+support for interceptors. The use of interceptors defined by means of
+the _Interceptors_ annotation is required to be supported for EJB and
+Managed Bean components, including in the absence of CDI. When CDI is
+enabled, the use of interceptors defined both by means of interceptor
+binding annotations and by means of the _Interceptors_ annotation is
+required to be supported for component classes that support injection,
+as described in the section “Annotations and Injection” of the Jakarta EE
+Platform specification link:intercept.html#a546[See Jakarta EE Platform 9.
+https://jakarta.ee/specifications/platform/9/.].
+
+Both the EJB and the CDI specifications
+provide extensions to this specification. Other specifications may
+choose to do so in the future. Such specifications are referred to in
+this document as extension specifications. This document outlines
+permissible extensions to this specification and defines requirements
+for extension specifications.