Add recommended layout/readme file for future tests

tests/README.txt

@@ -0,0 +1,43 @@
+Recommended Layout for Kernel Tests
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Add tests to enable Fedora CI [1] which are curated using the standard test interface [2]
+
+[1] https://fedoraproject.org/wiki/CI
+[2] https://fedoraproject.org/wiki/CI/Standard_Test_Interface
+
+As new pull requests are filed, please link/add your tests in one of the following directories
+to better organize the tests. If a new directory is required, which isn't included in the layout
+below, please add justification in the pull request. The directories can be created as new tests
+are added to dist-git.
+
+acpi
+cgroup
+cpu
+crc32c-self-check
+criu
+crypto
+drivers
+filesystem
+firmware
+ftrace
+include
+kabi
+kmod
+kpatch
+ksc
+kvm
+mce
+memory
+modules
+namespace
+networking
+performance
+powermgmt
+ptp
+scheduler
+security
+storage
+syscalls
+time
+update build