feat(application): add new metadata to frontmatter (#9)

* feat(frontmatter): frontmatter method to add key, values

* build: add pysnooper to aid in debugging

* feat(application): add new frontmatter

* build: clean up dev container

* fix(notes): diff now pretty prints in a table

* docs(readme): update usage information

* docs(readme): fix markdown lists

src/obsidian_metadata/models/enums.py

@@ -0,0 +1,11 @@
+"""Enum classes for the obsidian_metadata package."""
+
+from enum import Enum
+
+
+class MetadataType(Enum):
+    """Enum class for the type of metadata."""
+
+    FRONTMATTER = "Frontmatter"
+    INLINE = "Inline Metadata"
+    TAGS = "Inline Tags"