Create README.md

Author: Goose97

README.md

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+### Hướng dẫn cài đặt
+```
+wget https://statics.pancake.vn/thanos-test/cakecloud-postgres-exporter.tar.gz
+tar cakecloud-postgres-exporter.tar.gz
+cd cakecloud-postgres-exporter
+make project=<PROJECT_NAME> database_user=<USER> database_password=<PASSWORD> database_name=<DB_NAME> port=<PORT>
+```