Adding .editorconfig and rustfmt.toml

.editorconfig

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+# EditorConfig is awesome: https://EditorConfig.org
+
+# top-most EditorConfig file
+root = true
+
+[*]
+end_of_line = lf
+insert_final_newline = true
+charset = utf-8
+indent_style = space
+indent_size = 4
+trim_trailing_whitespace = true
+max_line_length = 100

rustfmt.toml

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+# Rustfmt configuration file
+
+# Set the maximum line width
+max_width = 100
+
+# Use 4 spaces for indentation
+tab_spaces = 4
+
+# Use the default set of rules
+# Uncomment the following line to enable custom rules
+# custom_rules = true
+
+## Nightly only, but preferrable
+# brace_style = "PreferSameLine"
+# enum_discrim_align_threshold = 30