Document supported packages (#1273)

docs/PACKAGES.md

@@ -0,0 +1,13 @@
+# Packages
+
+The following packages are supported on the F# track:
+
+| Package         | Version |
+| --------------- | ------- |
+| Aether          | 8.3.1   |
+| BenchmarkDotNet | 0.12.1  |
+| FParsec         | 1.1.1   |
+
+```exercism/caution
+If your code uses an unsupported packages/version combination, test runs on the website will fail.
+```

docs/config.json

@@ -28,6 +28,13 @@
       "title": "Useful F# resources",
       "blurb": "A collection of useful resources to help you master F#"
     },
+    {
+      "uuid": "f2379f3c-36d6-4442-8ad8-f62a5ad6932b",
+      "slug": "packages",
+      "path": "docs/PACKAGES.md",
+      "title": "Supported packages",
+      "blurb": "The list of packages that are supported on the F# track"
+    },
     {
       "uuid": "edfbb0fa-a950-4384-899f-6c6c7a440dca",
       "slug": "representer-normalizations",

exercises/shared/.docs/help.md

@@ -4,3 +4,8 @@ To get help if you're having trouble, you can use one of the following resources
 
 - [/r/fsharp](https://www.reddit.com/r/fsharp) is the F# subreddit.
 - [StackOverflow](http://stackoverflow.com/questions/tagged/f%23) can be used to search for your problem and see if it has been answered already. You can also ask and answer questions.
+
+## Packages
+
+The F# track supports a limited number of packages.
+Check the [list of supported packages](https://exercism.org/docs/tracks/fsharp/packages) to find out which.