Update README.md

Author: michplunkett

README.md

@@ -7,8 +7,12 @@ Various scripts written in Golang.
 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).
 
 #### Instructions
-```console
-mkdir -p ./SlackMessages
-cp [YOUR_ARCHIVE_PATH_HERE]/*.json ./SlackMessages/
-go run ./cmd/slackMessageParser/main.go
-```
+1. Move your files to the `SlackMessages` directory.
+    ```console
+    mkdir -p ./SlackMessages
+    cp [YOUR_ARCHIVE_PATH_HERE]/*.json ./SlackMessages/
+    go run ./cmd/slackMessageParser/main.go
+    ```
+2. Run the application via one of the following commands:
+    - `make parse-slack-data`
+    - `go run ./cmd/slackMessageParser/main.go`