Remove useless README.txt

README.txt

-Rugged, a sensor-to-terrain mapping tool, is a free java library
-for geolocation and used for satellite imagery.
-
-It is licensed by CS GROUP under the
-Apache License Version 2.0. A copy of this license is
-provided in the LICENSE.txt file.
-
-The BUILDING.txt file explains how the library can be built from sources.
-
-The src/main/java directory contains the library sources.
-The src/main/resources directory contains the library data.
-The src/test/java directory contains the tests sources.
-The src/test/resources directory contains the tests data.
-The src/tutorials/java directory contains sources for example use of the library.
-The src/design directory contains pieces for a UML model of the library.
-
-Rugged relies on the following free software, all released under
-business friendly free licenses.
-
-compile-time/run-time dependency:
-
-  - Orekit from CS GROUP
-    https://www.orekit.org/
-    released under the Apache Software License, version 2
-
-  - Hipparchus from the Hipparchus project
-    https://hipparchus.org/
-    released under the Apache Software License, version 2
-
-test-time dependency:
-
-  - JUnit 4 from Erich Gamma and Kent Beck
-    http://www.junit.org/
-    released under the Common Public License Version 1.0