doc: update README.md doc list, rename KERNEL.md to kernel.md.

README.md

@@ -21,16 +21,23 @@ License: GPLv3.  See `COPYING` for details.
 
 ## Documentation
 
-Documentation is available in directory `doc`. For details on several topics, see:
+Documentation is available in directory `doc`. It is organised by topics:
 
 * `API` for the RPC API specification;
+* `configuration.md` for (largely incomplete) detailed information on all
+  configuration options;
 * `FAQ.md` for frequently asked questions;
-* `GPU` for semi-obsolete information on GPU configuration options and mining SHA256d-based coins;
-* `KERNEL.md` for OpenCL kernel-related information;
-* `MINING.md` for how to find the right balance in GPU configuration to mine Scrypt-based coins effectively;
+* `GPU` for semi-obsolete information on GPU configuration options and mining
+  SHA256d-based coins;
+* `kernel.md` for OpenCL kernel-related information, including development
+  procedure;
+* `MINING.md` for how to find the right balance in GPU configuration to mine
+  Scrypt-based coins efficiently;
 * `windows-build.txt` for information on how to build on Windows.
 
-Note that **most of the documentation is outdated**. If you want to contribute, fork this repository, update as needed, and submit a pull request.
+Note that **most of the documentation is outdated or incomplete**. If
+you want to contribute, fork this repository, update as needed, and
+submit a pull request.
 
 
 ## Building
@@ -83,7 +90,8 @@ directory directly, or `make install` if you wish to install
 
 See `doc/windows-build.txt` for MinGW compilation and cross-compiation,
 `doc/cygwin-build.txt` for building using Cygwin, or use the provided
-`winbuild` Microsoft Visual Studio project (tested on MSVS2010).
+`winbuild` Microsoft Visual Studio project (tested on MSVS2010), with
+instructions in `winbuild/README.txt`.
 
 
 ## Basic Usage