Rename README files to README.txt (and several similar files).

Files without '.txt' suffix can't be handled well by Windows (users),
hence renaming such text files to *.txt makes FLTK more "Windows-friendly".

There are a few exceptions (this is intentional): README and other files
in bundled libraries (maintained upstream) are not changed.

1 files changed, 52 insertions, 0 deletions

diff --git a/README.IDE.txt b/README.IDE.txt
new file mode 100644
index 000000000..866260536
--- /dev/null
+++ b/README.IDE.txt
@@ -0,0 +1,52 @@
+-----------------------------------------
+  HOW TO BUILD AND USE FLTK WITH AN IDE
+-----------------------------------------
+
+Since FLTK 1.4 we do no longer include IDE [1] solution files in our
+source distribution. [2]
+
+If you want to build the FLTK library with an IDE you need to use
+CMake [3] to generate the IDE files from the source distribution.
+
+The FLTK team will officially support generation of selected IDE projects,
+particularly Visual C++ and Xcode. Older version support of these IDE
+projects will be limited to the versions that are supported by and can be
+generated with CMake.
+
+Other IDE solutions generated with CMake may or may not work. The FLTK
+team will try to support as many IDE solutions as possible, but we may
+need help to adjust the CMake files to fit a particular IDE project.
+
+
+Using CMake to generate IDE project files
+------------------------------------------------------------------------
+
+IDE files can easily be created using CMake and the provided CMake files.
+
+For more informations about using CMake to build FLTK please read the file
+README.CMake.txt in the root directory of the FLTK distribution.
+
+
+   Current Status as of Nov 2016:
+-------------------------------------
+
+   Xcode:        Supported       Known to work.
+   Visual C++:   Supported       Visual C++ 2015 generator known to work.
+
+   Other IDE's:  Not supported   Status unknown.
+
+Note: "Not supported" doesn't mean that a particular generator does not work,
+      but the FLTK team does not put much effort into making this IDE work,
+      hence it may work for you or not. Contributions welcome.
+
+--------------------------------------------------------------------------------
+
+[1] IDE = Integrated Development Environment,
+    for instance Visual Studio, Xcode, Eclipse, ...
+    https://en.wikipedia.org/wiki/Integrated_development_environment
+
+[2] The only exception is the Android Studio IDE in ide/AndroidStudio3
+    currently provided for testing. This IDE solution is likely to be
+    moved elsewhere or removed entirely before FLTK 1.4 will be released.
+
+[3] https://cmake.org/