Add repository-level README

Author: jthywiss

README.md

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+**THE ORC PROGRAMMING LANGUAGE**  
+**STRUCTURED CONCURRENT PROGRAMMING**
+
+**The University of Texas at Austin**
+
+
+# README for orc repository
+
+
+Welcome! This repository includes documentation, implementation, tools,
+libraries, tests, and examples for the Orc programming language.
+
+Orc can be used in several different ways:
+- In-Web-browser interface
+- Eclipse IDE plug-in
+- Command line JVM invocation
+- macOS application
+- Embedded in other applications
+- SOAP/JSON/RMI
+
+An in-browser version of Orc (called "Try Orc"), as well as downloadable
+versions and installation instructions are available at the Orc Web
+site: https://orc.csres.utexas.edu/ .  The Web site also provides the
+language tutorial and reference guides, discussion groups, a wiki, and
+more.
+
+There are numerous examples of Orc programs included in Try Orc, the
+tutorial and reference guides, and the OrcExamples subproject here.
+
+We encourage you to contact us via the discussion groups or e-mail if
+you have questions.  See the https://orc.csres.utexas.edu/ Web site for
+contact details.