Add some style guidelines to readme

1 files changed, 37 insertions, 0 deletions

diff --git a/readme.md b/readme.md
index da79939..7f9fbc0 100644
--- a/readme.md
+++ b/readme.md
@@ -217,3 +217,40 @@ Problem files
     razdalja = v ** 2 * sin(2 * kot_rad) / g
     print("Kroglo bo odneslo", razdalja, "metrov.")
     '''
+
+
+Style
+=====
+
+Please observe the following stylistic rules when adding or translating
+problems.
+
+  * Wrap lines at 80 columns (not a hard rule).
+
+Special characters
+------------------
+
+Use appropriate Unicode characters wherever possible. If your setup makes it
+difficult to enter these characters, copy them from this file.
+
+  * "foo" →  “foo” (english) or „foo“ (slovene)
+  * '     →  ’ (typographic apostrophe)
+  * ...   →  … (ellipsis)
+  * 2x3   →  2×3 (multiplication sign)
+  * <=    →  ≤
+  * >=    →  ≥
+  * ->    →  →
+  * =>    →  ⇒
+  * --    →  – (en dash)
+  * :)    →  ☺
+  * ;)    →  😉
+
+Some other useful characters:
+
+  * ∪ (set union)
+  * ∩ (set intersection)
+  * ∖ (set difference)
+  * ⊂
+  * ⊆
+  * ⊃
+  * ⊇