Added a core namespace with a -main method; upversioned.

Also, Interactive read-eval-print loop, debugging, and other minor enhancements.

.gitignore

@@ -0,0 +1,31 @@
+/target
+/classes
+/checkouts
+resources/scratch/
+profiles.clj
+pom.xml
+pom.xml.asc
+*.jar
+*.class
+/.lein-*
+/.nrepl-port
+.hgignore
+.hg/
+.idea/
+*~
+.calva/
+.clj-kondo/
+.lsp/
+resources/scratch.lsp
+Sysout*.lsp
+*.pdf
+
+src/beowulf/scratch.clj
+
+.portal/vs-code.edn
+
+.portal/
+
+.classpath
+.project
+.vscode