feat: базовая структура проекта; docs: грамматика формы бэкуса-наура

.gitignore

@@ -1,14 +1,16 @@
-# Generated by Cargo
-# will have compiled files and executables
-debug/
-target/
-
-# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
-# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
+# Rust
+/target/
+**/*.rs.bk
+*.pdb
 Cargo.lock
 
-# These are backup files generated by rustfmt
-**/*.rs.bk
+# IDE
+.idea/
+.vscode/
+*.swp
+*.swo
+*~
 
-# MSVC Windows builds of rustc generate these, which store debugging information
-*.pdb
+# OS
+.DS_Store
+Thumbs.db