readme update

-### Mattermost Team version Jabis'd cleanup utilities
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+### Mattermost Team version cleanup utilities
+
+Simplistic tool to clear self hosted mattermost from old files and entries in postgresql database
+
+#### Requirements
+- rust
+- make (optional)
+
+#### how to run
+- run `make all`
+- edit .env and modify to environment variables to suit your postgres installation and Mattermost directory
+**or** 
+`cargo build --release && cp target/release/mmjab ./mmjab && chmod +x ./mmjab` and run `./mmjab --help` to get explainer
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