Add directories for tests in cts-root test suite. am: 3e0383547a

Original change: https://android-review.googlesource.com/c/platform/test/cts-root/+/1594291

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I697af62b90d3e95f90dd6f3e7f0301224dba960e
diff --git a/hostsidetests/README.md b/hostsidetests/README.md
new file mode 100644
index 0000000..1d470b1
--- /dev/null
+++ b/hostsidetests/README.md
@@ -0,0 +1,2 @@
+This is the default directory for host-side tests in the cts-root test suite.
+Device-side tests should be placed in the cts-root/tests directory.
diff --git a/tests/README.md b/tests/README.md
new file mode 100644
index 0000000..ecea7a7
--- /dev/null
+++ b/tests/README.md
@@ -0,0 +1,3 @@
+This is the default directory for device-side tests in the cts-root test suite.
+
+Host-side tests should be placed in the cts-root/hostsidetests directory.