fixup! tests: add ztimer test applications

RIOT-OS · Dec 6, 2019 · 257872c · 257872c
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diff --git a/tests/ztimer_overhead/README.md b/tests/ztimer_overhead/README.md
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+# Introduction
+
+This test application sets up a ztimer_periph at 1MHz, then measures 1024
+times how much overhead ztimer adds.
+
+It uses the "ztimer_overhead()" function. See it's documentation for more
+information.