Add SeedQR encoding and test

src/tests/test_seedqr_encoding.py

@@ -0,0 +1,15 @@
+import sys
+from pathlib import Path
+
+sys.path.append(str(Path(__file__).resolve().parents[1]))
+
+from password_manager.seedqr import encode_seedqr
+
+
+def test_seedqr_standard_example():
+    phrase = (
+        "vacuum bridge buddy supreme exclude milk consider tail "
+        "expand wasp pattern nuclear"
+    )
+    expected = "192402220235174306311124037817700641198012901210"
+    assert encode_seedqr(phrase) == expected