[commit: nofib] master: Mention symlink situation on Git for Windows in README.md (c20122e)

[git at git.haskell.org]

Repository : ssh://git@git.haskell.org/nofib

On branch  : master
Link       : http://ghc.haskell.org/trac/ghc/changeset/c20122e0188b44d2a98dcada99ae41eb47c71f94/nofib

>---------------------------------------------------------------

commit c20122e0188b44d2a98dcada99ae41eb47c71f94
Author: Sebastian Graf <sgraf1337 at gmail.com>
Date:   Fri Jan 11 04:48:07 2019 -0500

    Mention symlink situation on Git for Windows in README.md


>---------------------------------------------------------------

c20122e0188b44d2a98dcada99ae41eb47c71f94
 README.md | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/README.md b/README.md
index 629cb4b..3e215e4 100644
--- a/README.md
+++ b/README.md
@@ -21,6 +21,19 @@ system GHC:
 
 ## Using
 
+<details>
+  <summary>Git symlink support for Windows machines</summary>
+  
+  NoFib uses a few symlinks here and there to share code between benchmarks.
+  Git for Windows has symlinks support for some time now, but
+  [it may not be enabled by default](https://stackoverflow.com/a/42137273/388010).
+  You will notice strange `make boot` failures if it's not enabled for you.
+  
+  Make sure you follow the instructions in the link to enable symlink support,
+  possibly as simple as through `git config core.symlinks true` or cloning with
+  `git clone -c core.symlinks=true <URL>`.
+</details>
+
 Then, to run the tests, execute:
 
 ```