Update README.md

README.md

@@ -1 +1,15 @@
-# dns-perf-test
+# DNS perf test
+DNS-perf-test program resolves domains from a file with a set number of requests per second. And it can save the results to files. The cache.data can be used in the dns-server-test program.
+## Usage
+```sh
+Commands:
+  Required parameters:
+    -file /example.txt            Domains file path
+    -DNS 0.0.0.0:00               DNS address
+    -listen 0.0.0.0:00            Listen address
+    -RPS 00000                    Request per second
+  Optional parameters:
+    -save                         Save DNS answer data to cache.data,
+                                  DNS answer domains to out_domains.txt,
+                                  DNS answer IPs to ips.txt
+```