Add link for Cygwin, update and structure information

Downloads.md

@@ -1,16 +1,29 @@
 # Downloads
 
+## Source Code
+
 Source code of Tesseract's [Releases](https://github.com/tesseract-ocr/tesseract/releases).
 
+## Binaries for Linux
 
-## Old Downloads
+Tesseract is included in most Linux distributions.
+
+## Binaries for Mac OS
+
+Please add information here.
+
+## Binaries for Windows
+
+### Old Downloads
 
 [Downloads Archive on SourceForge](http://sourceforge.net/projects/tesseract-ocr-alt/files/).
 There you can find, among other files, Windows installer for the **old** version 3.02. 
 
 Currently, there is no **official** Windows installer for newer versions.
 
-## 3rd party Windows exe's/installer
+### 3rd party Windows exe's/installer
+
+  * Cygwin includes [packages for Tesseract](https://cygwin.com/cgi-bin2/package-grep.cgi?grep=tesseract&arch=x86_64).
 
   * binaries compiled by @egorpugin (ref issue # 209)
     https://www.dropbox.com/s/8t54mz39i58qslh/tesseract-3.05.00dev-win32-vc19.zip?dl=1
@@ -19,4 +32,4 @@ Currently, there is no **official** Windows installer for newer versions.
     Leptonica is built with all libs except for libjp2k.
 
   * https://github.com/UB-Mannheim/tesseract/wiki
-  * http://domasofan.spdns.eu/tesseract/
+  * http://domasofan.spdns.eu/tesseract/ (site down?)