Add admonitions

Added Github flavoured admonitions to test if it works with Gitea.
See https://github.com/orgs/community/discussions/16925.

README.md

@@ -1,3 +1,20 @@
 # Karalama
 
-Karalama ve denemeler yapmak için
+Karalama ve denemeler yapmak için
+
+## Admonitions
+
+> [!NOTE]
+> This is a note admonition.
+
+> [!TIP]
+> This is a tip admonition.
+
+> [!WARNING]
+> This is a warning admonition.
+
+> [!IMPORTANT]
+> This is an important admonition.
+
+> [!CAUTION]
+> This is a caution admonition.