Update README.md

Author: michplunkett

README.md

@@ -4,7 +4,14 @@ Various scripts written in Golang.
 ## Scripts
 
 ### Slack Message Parser
-This tool is used to parse the `json`-formatted data that comes from [exporting Slack workspace data](https://slack.com/help/articles/201658943-Export-your-workspace-data).
+This tool is used to parse the `json`-formatted data that comes from [exporting Slack workspace data](https://slack.com/help/articles/201658943-Export-your-workspace-data) into a `csv` file named: `slack_records.csv`.
+
+`csv` format:
+TimeStamp,UserID,UserName,RealName,MessageType,Text,Attachments,Files
+
+| TimeStamp | UserID | UserName | RealName | MessageType |  Text  | Attachments |  Files   |
+|:---------:|:------:|:--------:|:--------:|:-----------:|:------:|:-----------:|:--------:|
+|  string   | string |  string  |  string  |   string    | string |  []string   | []string |
 
 #### Instructions
 1. Move your files to the `SlackMessages` directory.