mention C++ compatibility in the docs on master

doc/index.rst

@@ -1,16 +1,21 @@
 Introduction
 ============
 
-open62541 (http://open62541.org) is an open source implementation of OPC UA
-(short for OPC Unified Architecture). open62541 is a C-based library (linking
-with C++ projects is possible) with all necessary tools to implement dedicated
-OPC UA clients and servers, or to integrate OPC UA-based communication into
-existing applications. open62541 is licensed under Mozilla Public License v2.0.
-So the *open62541 library can be used in projects that are not open source*.
-However, changes to the open62541 library itself need to published under the
-same license. The plugins, as well as the provided example servers and clients
-are in the public domain (CC0 license). They can be reused under any license and
-changes do not have to be published.
+open62541 (http://open62541.org) is an open source and free implementation of
+OPC UA (OPC Unified Architecture) written in the common subset of the C99 and
+C++98 languages. The library is usable with all major compilers and provides the
+necessary tools to implement dedicated OPC UA clients and servers, or to
+integrate OPC UA-based communication into existing applications. open62541
+library is platform independent. All platform-specific functionality is
+implemented via exchangeable plugins. Plugin implementations are provided for
+the major operating systems.
+
+open62541 is licensed under the Mozilla Public License v2.0. So the *open62541
+library can be used in projects that are not open source*. Only changes to the
+open62541 library itself need to published under the same license. The plugins,
+as well as the server and client examples are in the public domain (CC0
+license). They can be reused under any license and changes do not have to be
+published.
 
 OPC Unified Architecture
 ------------------------