Use README.md in root directory

diff --git a/README.md b/README.md
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+# WinMerge Source Code
+
+Source code for the WinMerge program, its plugins, filters, setup program,
+and various utilities are all kept in various subfolders listed below.
+
+Changelog file is in `Docs/Users/ChangeLog.txt` and it logs user-visible
+or otherwise significant changes.
+
+Subfolders include:
+
+ - `Docs`
+   Both user and developer documentation, in different subfolders.
+   Can be browsed by opening `index.html` in `Docs` folder.
+
+ - `Src`
+   Source code to the WinMerge program itself.
+
+ - `Plugins`
+   Source code and binaries for WinMerge runtime plugin dlls & scripts
+
+ - `Filters`
+   WinMerge file filters which are shipped with the distribution.
+
+ - `ArchiveSupport`
+   Source code for the Merge7z dlls, which connect WinMerge with 7-Zip
+   Also this folder is required to compile `WinMergeU.exe`. There
+   is also standalone installer for Merge7z dlls.
+
+ - `Externals`
+   This folder contains several libraries whose sources come from
+   outside WinMerge project. They are stored here for convenience for
+   building and possible needed small changes for WinMerge. Libraries
+   include XML parser and regular expression parser.
+
+ - `Installer`
+   Installer for WinMerge.
+
+ - `Tools`
+   Various utilities used by WinMerge developers; see readme files in each.
+
+ - `ShellExtension`
+   Windows Shell (Explorer) integration. Adds menuitems to Explorer context
+   menu for comparing files and folders.
+
+ - `Testing`
+   A suite of test diff files and a script to run them and report the results.
+   This folder also has `Google Test` subfolder containing unit tests made
+   with [Google Test Framework](https://github.com/google/googletest).
+
+ - `Build`
+   This folder gets created by compiler when WinMerge is compiled. It
+   contains compiled executables, libraries, user manual etc.
+
+ - `BuildTmp`
+   This folder gets created by compiler when WinMerge is compiled. It
+   contains temporary files created during the compilation and can be safely
+   removed.

diff --git a/readme.txt b/readme.txt
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-WinMerge\readme.txt
-
-Source code for the WinMerge program, its plugins, filters, setup program,
-and various utilities are all kept in various subfolders listed below.
-
-Changelog file is in Docs/Users/ChangeLog.txt and it logs user-visible
-or otherwise significant changes. Subversion commit messages provide a
-detailed changelog for all the changes. Commit messages also have a
-SourceForge.net tracker number mentioned when the commit is related to
-one of the tracker items.
-
-Subfolders include:
-
- - Docs
-    Both user and developer documentation, in different subfolders.
-    Can be browsed by opening index.html in Docs folder.
-
- - Src
-    source code to the WinMerge program itself
-
- - Plugins
-    source code and binaries for WinMerge runtime plugin dlls & scripts
-
- - Filters
-    WinMerge file filters which are shipped with the distribution
-
- - ArchiveSupport
-    source code for the Merge7z dlls, which connect WinMerge with 7-Zip
-    Also this folder is required to compile WinMerge(U).exe. There
-    is also standalone installer for Merge7z dlls.
-
- - Externals
-    This folder contains several libraries whose sources come from
-    outside WinMerge project. They are stored here for convenience for
-    building and possible needed small changes for WinMerge. Libraries
-    include XML parser and regular expression parser.
-
- - Installer
-    Installer for WinMerge
-
- - Tools
-    Various utilities used by WinMerge developers; see readme files in each
-
- - ShellExtension
-   Windows shell (Explorer) integration. Adds menuitems to Explorer context
-   menu for comparing files and folders.
-
- - Testing
-    A suite of test diff files and a script to run them and report the results.
-    This folder also has 'Google Test' subfolder containing unit tests made
-    with Google Test -framework.
-
- - Build
-    This folder gets created by compiler when WinMerge is compiled. It
-    contains compiled executables, libraries, user manual etc.
-
- - BuildTmp
-    This folder gets created by compiler when WinMerge is compiled. It
-    contains temporary files created during the compilation and can be safely
-    removed.