Add repository docs and editor encoding settings

.editorconfig

@@ -0,0 +1,53 @@
+# EditorConfig is awesome: https://EditorConfig.org
+
+# top-most EditorConfig file
+root = true
+
+# Unix-style newlines with a newline ending every file
+[*]
+end_of_line = lf
+insert_final_newline = true
+charset = utf-8
+
+# KOI8-R encoded files (legacy 1998 archive)
+# Set charset explicitly for IDE/editor to avoid auto-conversion
+[*.htm]
+charset = koi8-r
+
+[*.html]
+charset = koi8-r
+
+[*.conf]
+charset = koi8-r
+
+[html/_b/**]
+charset = koi8-r
+
+[html/_co/**]
+charset = koi8-r
+
+[html/_ex/**]
+charset = koi8-r
+
+[html/_fr/**]
+charset = koi8-r
+
+[html/_pb/**]
+charset = koi8-r
+
+[html/_pr/**]
+charset = koi8-r
+
+[html/_sh/**]
+charset = koi8-r
+
+# Git and config files (UTF-8)
+[.git*]
+charset = utf-8
+
+[.editorconfig]
+charset = utf-8
+
+[README*]
+charset = utf-8
+