Add precompilation message

Author: lkdvos

src/TensorOperations.jl

@@ -75,6 +75,20 @@ const costcache = LRU{Any,Any}(; maxsize=10^5)
 using PackageExtensionCompat
 function __init__()
     @require_extensions
+
+    @info """
+        TensorOperations can optionally be instructed to precompile several functions, which can be used to reduce the time to first execution (TTFX).
+        This is disabled by default as this can take a while on some machines, and is only relevant for contraction-heavy workloads.
+
+        To enable or disable precompilation, you can use the following script:
+
+        ```julia
+        using TensorOperations, Preferences
+        set_preferences!(TensorOperations, "precompile_workload" => true; force=true)
+        ```
+
+        This will create a `LocalPreferences.toml` file next to your current `Project.toml` file to store this setting in a persistent way.
+        """ maxlog = 1
 end
 
 include("precompile.jl")