Update readme.md

Author: chadmcox

Log Analytics/readme.md

@@ -30,7 +30,12 @@ SigninLogs
 ```
 ## SigninLogs - AuthenticationDetails
 ```
-
+SigninLogs
+| mv-expand todynamic(AuthenticationDetails)
+| extend AuthenticationDetails_authenticationMethod = tostring(AuthenticationDetails["authenticationMethod"])
+| extend AuthenticationDetails_authenticationStepRequirement = tostring(AuthenticationDetails["authenticationStepRequirement"])
+| extend AuthenticationDetails_succeeded = tostring(AuthenticationDetails["succeeded"])
+| project TimeGenerated, UserPrincipalName, ResultType, ResultDescription,city,state,IPAddress,operatingSystem, UserAgent, RiskLevelAggregated, RiskLevelDuringSignIn,MfaDetail_authMethod,MfaDetail_authDetail, AuthenticationDetails_authenticationMethod, AuthenticationDetails_authenticationStepRequirement, AuthenticationDetails_succeeded
 ```
 
 ## SigninLogs - ConditionalAccessPolicies