git: Add '.editorconfig' and update '.gitignore'.

.editorconfig

@@ -0,0 +1,12 @@
+# Acoused .editorconfig
+
+root = true
+
+[*.py]
+charset = utf-8
+indent_style = space
+indent_size = 4
+tab_width = 8
+end_of_line = lf
+trim_trailing_whitespace = true
+insert_final_newline = true

.gitignore

@@ -1,3 +1,6 @@
+TAGS
+Error_file.txt
+
 # Created by https://www.toptal.com/developers/gitignore/api/python
 # Edit at https://www.toptal.com/developers/gitignore?templates=python