test/README.md: Fix MD041 warnings

The following warnings are generated by using markdownlint analysis:
```
MD041/first-line-heading/first-line-h1 First line in a file should be a top-level heading [Context: "Instructions on how to execute..."]
```
Refer to markdown-lint [1] to fix MD041
[1]: https://github.com/updownpress/markdown-lint/blob/master/rules/041-first-line-h1.md

Signed-off-by: George Liu <liuxiwei@ieisystem.com>
Change-Id: Iff7add9bc536168a651885fd8506889feb0d4d0d
diff --git a/test/README.md b/test/README.md
index c8335f5..3ca46c9 100755
--- a/test/README.md
+++ b/test/README.md
@@ -1,3 +1,5 @@
+# UTEST
+
 Instructions on how to execute UTEST.
 
 - When using an SDK - make sure it has been built for an x86 machine.