convert README.txt to markdown

README.md

+The NPS Scenario Authoring and Visualization for Advanced Graphical Environments
+(SAVAGE) Research Group maintains a large archive of dynamic 3D military models
+and open-source authoring tools, all built using Extensible 3D (X3D) graphics.
+
+Archive support includes X3D-Edit authoring tool, X3D Tooltips, X3D Validator,
+complete course slidesets and videos, plus this open-source model archive.
+Source changes are maintained in version control and bug tracking is online.
+
+Online Links
+
+1. https://savage.nps.edu/Savage
+2. https://savage.nps.edu/X3dExamplesSavage.zip
+3. http://www.web3d.org/x3d/content/examples/X3dResources.html#Savage
+4. https://savage.nps.edu/Savage/license.html
+5. http://www.web3d.org/x3d/content/examples (redirects to)
+   http://www.web3d.org/x3d/content/examples/X3dResources.html#Examples
+
+Additional References
+
+6.  http://x3dgraphics.com
+7.  http://x3dgraphics.com/slidesets
+8.  https://savage.nps.edu/X3D-Edit
+9.  https://savage.nps.edu/X3dValidator
+10. http://www.web3d.org/x3d/content/examples (redirects to)
+    http://www.web3d.org/x3d/content/examples/X3dResources.html
+11. http://www.web3d.org/x3d/content/examples/X3dResources.html#Tooltips
+12. http://www.web3d.org/x3d/content/examples/X3dSceneAuthoringHints.html
+13. https://www.movesinstitute.org/Video/Courses/X3dForWebAuthors/X3dForWebAuthorsVideo.html
+14. https://savage.nps.edu/Savage/developers.html
+15. http://www.web3d.org/specifications
+16. http://www.web3d.org/standards
+
+Build scripts are written using Ant with build.xml found in the archive's root.
+
+17. https://savage.nps.edu/Savage/build.xml
+
+Latest version of this README.md file can be found at
+
+18. https://savage.nps.edu/Savage/README.md
+
+X3D Examples Archive maintainer: Don Brutzman, brutzman@nps.edu