Add .gitignore to exclude unnecessary files

The .gitignore file excludes IDE-specific, system-generated, temporary, and backup files, as well as common unwanted formats. It ensures cleaner version control by including only relevant project files while ignoring clutter.

.gitignore

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+# Ignore IntelliJ IDEA project-specific files
+.idea/
+*.iml
+*.iws
+
+# Ignore OS generated files
+.DS_Store
+.DS_Store?
+Thumbs.db
+ehthumbs.db
+Desktop.ini
+
+# Ignore temporary files
+*.tmp
+*.swp
+*.swo
+*.bak
+*.orig
+
+# Ignore hidden system files
+.*.s[a-v][a-z]
+.*un~
+$RECYCLE.BIN/
+
+# Ignore logs and runtime files
+*.log
+*.pid
+*.seed
+*.gz
+
+# Ignore clutter generated by markdown previews/editors
+*.markdown-tmp
+.markdown-cache/
+
+# Ignore common backup files
+*.~*
+*.save
+*~
+
+# Ignore unnecessary files for compressed formats (if extracting archives is needed)
+*.zip
+*.tar
+*.tar.gz
+*.rar
+
+# Ignore image editor temp files (if images are modified)
+*.xcf~
+*.psd~
+
+# Ignore binary thumbnails or preview files (if editors generate them)
+*.thumbs
+
+# Ignore files specific to versioning history outside Git
+*.orig
+
+# Include images, documents, and markdown explicitly (so they're not accidentally excluded)
+!*.md
+!*.markdown
+!*.png
+!*.jpg
+!*.jpeg
+!*.gif
+!*.pdf
+!*.doc
+!*.docx
+!*.ppt
+!*.pptx
+!*.xls
+!*.xlsx
+!*.odt
+
+# Ensure backup or runtime-related folders are ignored (user-configurable)
+backup/
+temp/
+generated/