Add EditorConfig and YouCompleteMe files

.editorconfig

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+# https://editorconfig.org
+
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+indent_style = tab

.ycm_extra_conf.py

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+import os
+
+def Settings(**kwargs):
+	if not os.path.exists("venv"):
+		raise Exception("Run tools/create_venv.sh first")
+
+	return {
+		"interpreter_path": "./venv/bin/python"
+	}