Add continuous integration pipeline

Added static analysis (lint, type checking) to be done on each push, and
testing to be done on each master branch commit.

tests/test_annotation.py

@@ -0,0 +1,7 @@
+from papis_extract.annotation_data import Annotation
+
+
+def test_matches_colorname_exact():
+    sut = Annotation("testfile", colors={"stroke": (1.0, 0.0, 0.0)})
+    c_name = sut.colorname
+    assert c_name == "red"