Update README.md

Author: infinitnet

README.md

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-# wordpress-date-shortcodes
-Adds shortcodes for current, published, and last modified year and month.
+# WordPress Date Shortcodes
+WordPress plugin that adds shortcodes for current, published, and last modified year and month.
+
+## Purpose
+The main purpose of this plugin is to dynamically add dates to post titles. The shortcodes also work in meta descriptions (Rank Math and Yoast) and post content.
+
+## Available Shortcodes
+- **[currentmonth]** - current month
+- **[currentyear]** - current year
+- **[publishedmonth]** - month the post/page was published
+- **[publishedyear]** - year the post/page was published
+- **[modifiedmonth]** - month the post/page was last modified
+- **[modifiedyear]** - year the post/page was last modified
+
+## Compatibility
+The WordPress Date Shortcodes plugin is compatible with:
+- Rank Math
+- Yoast SEO
+- Contextual Related Posts (CRP)