Reorg documentation layout. Rename manual to handbook.

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+Support Information
+=======================
+
+Supported Platforms
+------------------------
+
+For Botan 2, the tier-1 supported platforms are
+
+* Linux x86-64, GCC 4.8 or higher
+* Linux x86-64, Clang 3.5 or higher
+* Linux aarch64, GCC 4.8+
+* Linux ppc64le, GCC 4.8+
+* Windows x86-64, Visual C++ 2015 and 2017
+
+These platforms are all tested by continuous integration, and the developers
+have access to hardware in order to test patches. Problems affecting these
+platforms are considered release blockers.
+
+For Botan 2, the tier-2 supported platforms are
+
+* Linux x86-32, GCC 4.8+
+* Linux arm32, GCC 4.8+
+* Windows x86-64, MinGW GCC
+* Apple OS X x86-64, XCode Clang
+* iOS arm32/arm64, XCode Clang
+* Android arm32, NDK Clang
+* FreeBSD x86-64, Clang 3.8+
+* IncludeOS x86-32, Clang 3.8+
+
+Some (but not all) of the tier-2 platforms are tested by CI. Everything should
+work, and if problems are encountered, the developers will probably be able to
+help. But they are not as carefully tested as tier-1.
+
+Of course most other modern OSes such as QNX, AIX, OpenBSD, NetBSD, and Solaris
+also work just fine. Some are tested occasionally, usually just before a new
+release. But very little code specific to these platforms is written by the
+primary developers. For example, any functionality in the library which
+utilizes OpenBSD specific APIs was likely contributed by someone interested in
+that platform.
+
+In theory any working C++11 compiler is fine but in practice, we only regularly
+test with GCC, Clang, and Visual C++. Recent versions of IBM XLC can compile
+the library but occasionally codegen bugs occur. Several other compilers (such
+as Intel and PGI) are supported by the build system but are not tested by the
+developers and may have build or codegen problems. Patches to improve support
+for these compilers is welcome.
+
+Branch Support Status
+-------------------------
+
+Following table provides the support status for Botan branches as of August 2018.
+Any branch not listed here (including 1.11) is no longer supported.
+Dates in the future are approximate.
+
+============== ============== ========================== ============
+Branch         First Release  End of Active Development  End of Life
+============== ============== ========================== ============
+1.8            2008-12-08     2010-08-31                 2016-02-13
+1.10           2011-06-20     2012-07-10                 2018-12-31
+2.x            2017-01-06     2020?                      2022 or later
+3.x            2020?          ?                          ?
+============== ============== ========================== ============
+
+"Active development" refers to adding new features and optimizations. At the
+conclusion of the active development phase, only bugfixes are applied.
+
+Getting Help
+------------------
+
+To get help with Botan, open an issue on
+`GitHub <https://github.com/randombit/botan/issues>`_