Initial node implementation (#4)

Reviewed-on: #4
Co-authored-by: Zack <zack@bfpower.io>
Co-committed-by: Zack <zack@bfpower.io>

rustfmt.toml

@@ -0,0 +1,8 @@
+imports_granularity = "Module"
+format_strings = true
+wrap_comments = true
+match_block_trailing_comma = true
+enum_discrim_align_threshold = 25
+fn_call_width = 100
+comment_width = 120
+single_line_if_else_max_width = 100