Add basic functionality tests

tests/config.nims

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+switch("path", "$projectDir/../src")

tests/test1.nim

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+import unittest
+import ../src/logging
+
+test "Emit logging messages":
+  var log = getLogger("main", {"extra1": "one", "extra2": "two"})
+  log.always "This is an info message"
+
+test "Shorthand methods":
+  var log = getLogger("shorthand")
+  log.always("This should always appear")
+  log.fatal("Such a terrible thing, a FATAL error; bye?")
+  log.critical("The engines are at CRITICAL level!!")
+  log.error("Something went wrong, I caught an ERROR")
+  log.warning("This is your first WARNING, ok?")
+  log.warn("This is your second WARNING, ok?")
+  log.quiet("Something important, say it QUIET")
+  log.info("Some INFOrmational data")
+  log.noisy("Level is low enough that it's NOISY")
+  log.debug("I don't see this unless I'm DEBUGging")
+  log.trace("We're TRACEing the code as we speak")
+
+test "Emit different levels":
+  var log = getLogger("levels")
+  for l in LogLevel:
+    log.write(l, "level example", {"log-level": $l})
+
+test "Emit different formats":
+  var log = getLogger("formats")
+  for fmt in LogOutputFormat:
+    setLogOutputFormat(fmt)
+    log.always("format example", {"format": $fmt})
+
+# Fin.