Added some text files describing the directory organization.

Author: crisluengo

changelogs/readme.txt

@@ -0,0 +1,6 @@
+The files in this directory contain the change logs. For the 3.0.0 release, which has
+a huge change log, we keep two separate files. These files are identical to the ones
+at https://diplib.org/changelogs/
+
+As you commit things to the master branch, add relevant notes to the latest change
+log file, so that it is easy to create a release.

repository_organization.txt

@@ -0,0 +1,26 @@
+Here we describe the organization of the repository, which is getting
+increasingly complex and large.
+
+changelogs/     This is where the change logs are stored.
+
+dependencies/   External code needed for building the DIPlib project,
+                but not necessary to compile code that uses DIPlib.
+
+dipimage/       Sources for DIPimage, the MATLAB toolbox.
+
+doc/            Additional DIPlib documentation in the form of Markdown files,
+                and other files needed by the documentation build system.
+
+examples/       Example source code in C++ and Python.
+
+include/        All the C++ public header files.
+
+javaio/         The DIPjavaio module (BioFormats interface) C++ and Java source code.
+
+pydip/          The PyDIP (Python bindings) C++ and Python source code.
+
+src/            The DIPlib C++ source code.
+
+tools/          Assorted scripts needed for building the DIPlib project.
+
+viewer/         The DIPviewer module C++ source code

src/readme.txt

@@ -7,12 +7,12 @@ detection/        Feature detection (diplib/detection.h)
 display/          Preparing images for display (diplib/display.h)
 distance/         Distance transforms (diplib/distance.h)
 file_io/          Image file I/O (diplib/file_io.h)
-linear/           Linear filters (diplib/linear.h)
 geometry/         Interpolation and geometric transformations (diplib/geometry.h)
 generation/       Creating image data (diplib/generation.h)
 histogram/        Histograms (diplib/histogram.h, diplib/distribution.h)
 library/          Core library functionality (diplib/library/*.h, diplib/boundary.h, diplib/framework.h,
                                               diplib/kernel.h, diplib/neighborlist.h, diplib/pixel_table.h)
+linear/           Linear filters (diplib/linear.h)
 mapping/          Grey-value mapping (diplib/lookup_table.h, diplib/mapping.h)
 math/             Pixel math (diplib/math.h, diplib/statistics.h)
 measurement/      Measurement infrastructure and functions (diplib/measurement.h, diplib/chain_code.h)
@@ -23,10 +23,3 @@ regions/          Labeling and labeled image processing (diplib/regions.h)
 segmentation/     Segmentation (diplib/segmentation.h)
 support/          Functions that don't work on images (diplib/library/numeric.h)
 transform/        Fourier and related transforms (diplib/transform.h, diplib/dft.h)
-
-../dependencies/* External code needed for compilation of DIPlib and/or components,
-                  but not necessary to compile code that uses DIPlib.
-
-../include/       All the public header files
-
-../doc/src/       Additional DIPlib documentation in the form of Markdown files