chore: add .editorconfig and .gitattributes

Add .editorconfig for consistent formatting and .gitattributes
for line ending normalization.

.editorconfig

@@ -0,0 +1,21 @@
+root = true
+
+[*]
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+charset = utf-8
+
+[*.{c,h,cpp,hpp}]
+indent_style = space
+indent_size = 4
+
+[*.{yml,yaml}]
+indent_style = space
+indent_size = 2
+
+[*.md]
+trim_trailing_whitespace = false
+
+[Makefile]
+indent_style = tab

.gitattributes

@@ -0,0 +1,24 @@
+# Auto detect text files and perform LF normalization
+* text=auto
+
+# Explicitly declare text files
+*.md text diff=markdown
+*.txt text
+*.csv text
+*.yml text
+*.yaml text
+*.json text
+*.xml text
+*.html text diff=html
+*.css text diff=css
+
+# Denote binary files
+*.png binary
+*.jpg binary
+*.jpeg binary
+*.gif binary
+*.ico binary
+*.pdf binary
+*.zip binary
+*.gz binary
+*.tar binary