docs(README): add project status notice (#215)

README.md

@@ -23,9 +23,14 @@
 a [re-continued][original] mod for [**Slay the Spire**][sts], which adds
 **[Marisa Kirisame][marisa]** from Touhou Project as a playable character.
 
-> **Note** _**Marisa:** Continued_ is a fork of [STS_ThMod_MRS][original-github]
+> **Note** 
+> _**Marisa:** Continued_ is a fork of [STS_ThMod_MRS][original-github]
 > mod. Credits goes to the original authors.
 
+> **Warning**
+> Due to life issues, this project is **currently not reciving active maintenance**.
+> While I will review PRs as soon as possible, please note that I may not be able to dedicate much time on this project. Consequently, issues may not be addressed in a timely manner. I apologize for the inconvenience.
+
 ## New features
 
 ### Better UI for amplifiable cards