Add .gitignore file

.gitignore

@@ -0,0 +1,35 @@
+*.o
+.DS_Store
+.*.swp
+/env
+/dl
+/.config
+/.config.old
+/.toolchain_build_ver
+/bin
+/build_dir
+/staging_dir
+/tmp
+/logs
+/feeds
+/feeds.conf
+/files
+/target/linux/feeds
+/overlay
+/package/feeds
+/package/openwrt-packages
+/*.patch
+/llvm-bpf*
+key-build*
+*.orig
+*.rej
+*~
+.#*
+*#
+.emacs.desktop*
+TAGS*~
+git-src
+.project
+.cproject
+.ccache
+.vscode*