Update README.md

README.md

-# How to use spack on mistral
+# How to use spack on Levante
 
-Mistral already has many packages installed using spack and the module system
-is configured to handle these packages in addition to the old ones.
+Levante already has some packages installed using spack and corresponding module system.
 
 If you want to use more features of spack and potentially build your own
 software, here are a few steps that should help you with that.
 
+Since levante's software tree is under development, please check the available packages and module on a regular basis.
+
 ## Get the spack source code - release 0.17.1
 
 The first thing you need is the spack software. It is only availble via github.
@@ -72,7 +73,7 @@ the repo.
 
 ### ANW
 
-If you want your are part of the application group k20200, you can use the already existing packages with
+If you are part of the application group k20200, you can use the already existing packages with
 
 ```txt
 config: