change: update readme.md

example/sd/README.md

@@ -1,6 +1,11 @@
-#
+# Issue 192
+
+<img width="1074" alt="SpeedTest-Go" src="https://github.com/showwin/speedtest-go/assets/30739857/203da134-77f7-46a1-bed2-2df3c43ffc7c">
 
 1. Use welford alg to quickly calculate standard deviation and mean.
-2. The welford method integrated moving window feature, This allows us to ignore early data with excessive volatility.
-3. Use the coefficient of variation(c.v) to reflect the confidence of the test result datasets.
-4. When the c.v is less than 0.05, we terminate this test.
+2. (a)The welford method integrated moving window feature, This allows us to ignore early data with excessive volatility.
+3. (b)The welford method integrated moving Average feature, compare with 2a, this causes early data to be diluted gradually rather than immediately.
+4. Use the coefficient of variation(c.v) to reflect the confidence of the test result datasets.
+5. When the c.v is less than 0.05, we terminate this test.
+
+Is there a better way?