Git application test.

Applications/git/README.md

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+# Git Application test
+
+This test tests a file-system's performance creating and manipulating small files by cloning the Spack repository.
+
+Slow file-systems time out while doing this.  
+
+The test is simple:
+
+```console
+$ time git clone https://github.com/spack/spack.git
+Cloning into 'spack'...
+remote: Enumerating objects: 325196, done.
+remote: Counting objects: 100% (525/525), done.
+remote: Compressing objects: 100% (321/321), done.
+remote: Total 325196 (delta 207), reused 376 (delta 120), pack-reused 324671
+Receiving objects: 100% (325196/325196), 134.56 MiB | 3.37 MiB/s, done.
+Resolving deltas: 100% (140857/140857), done.
+Updating files: 100% (8707/8707), done.
+
+real	11m42.167s
+user	0m27.791s
+sys	0m7.893s
+```
+
+This test is pass/fail.