Update README.md

Author: sumiya11

README.md

@@ -17,6 +17,8 @@ Groebner.jl is distributed under GNU GPL v2.
 For documentation please check out https://sumiya11.github.io/Groebner.jl.
 For a simple example, see below.
 
+For development plan: [Plans for 2025](https://github.com/sumiya11/Groebner.jl/issues/177).
+
 ## Installation
 
 You can install Groebner.jl using the Julia package manager. From the Julia REPL, type