[Doc] Add chartable documentation

diff --git a/doc/markdown/modules/chartable.md b/doc/markdown/modules/chartable.md
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..f5aa553229ef43a6c596ea01345fa1d4a3089c28 100644 (file)
--- a/doc/markdown/modules/chartable.md
+++ b/doc/markdown/modules/chartable.md
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+# Chartable module
+
+This module allows to find number of characters from the different [unicode scripts](http://www.unicode.org/reports/tr24/). Finally, it evaluates number of scrips changes, e.g. 'a網絡a' is treated as 2 script changes - from latin to chineese and from chineese back to latin, divided by total number of unicode characters. If the product of this division is higher than threshold then a symbol is inserted. By default threshold is `0.1` meaning that script changes occurrs approximantely for 10% of characters.
+
+~~~nginx
+chartable {
+  symbol = "R_CHARSET_MIXED";
+  threshold = 0.1;
+}
+~~~
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