Update README.md

Author: ZebinYang

README.md

@@ -4,10 +4,12 @@
 # Installation
 
 - Enviroment: 
-    - Python 3.8
-    - R 3.5
+    - Python 3.7+
+    - conda 
 
-Assume you have figured out the above environment, the most convenient way for installation is via the pip command. 
+Assume you have figured out the above environment, the most convenient way for installation is via the following commands. 
 ```sheel
+conda install r-base
+conda install r-bigsplines
 pip install git+https://github.com/ZebinYang/simtree.git
 ```