Add editor config files to repo

.editorconfig

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+# EditorConfig configuration for systemd
+# http://EditorConfig.org
+
+# NOTE: If you update this file make sure to update .dir-locals.el and .vimrc,
+# too.
+
+# Top-most EditorConfig file
+root = true
+
+# Unix-style newlines with a newline ending every file, utf-8 charset
+[*]
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+charset = utf-8
+
+[NEWS]
+indent_style = space
+indent_size = 4
+
+# Match config files, set indent to spaces with width of eight
+[*.{c,h}]
+indent_style = space
+indent_size = 8
+max_line_length = 109
+
+[*.sh,mkosi.build,mkosi.prepare,mkosi.postinst]
+indent_style = space
+indent_size = 4
+
+[meson.build]
+indent_style = space
+indent_size = 8
+

.vimrc

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+" 'set exrc' in ~/.vimrc will read .vimrc from the current directory
+" Warning: Enabling exrc is dangerous! You can do nearly everything from a
+" vimrc configuration file, including write operations and shell execution.
+" You should consider setting 'set secure' as well, which is highly
+" recommended!
+
+" Note that we set a line width of 109 for .c and XML files, but for everything
+" else (such as journal catalog files, unit files, README files) we stick to a
+" more conservative 79 characters.
+
+" NOTE: If you update this file make sure to update .dir-locals.el and
+" .editorconfig, too.
+
+set tabstop=8
+set shiftwidth=8
+set expandtab
+set makeprg=GCC_COLORS=\ make
+set tw=79
+au BufRead,BufNewFile *.xml set tw=109 shiftwidth=2 smarttab
+au FileType sh set tw=109 shiftwidth=4 smarttab
+au FileType c set tw=109 shiftwidth=8