add readme

README.md

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+# PLEWI
+- clone PLEWI repo into ~/
+- run following commands:
+  - git clone https://git.wmi.amu.edu.pl/s470607/transfix-train.git
+  - cd transfix-train
+  - ./plewi.sh
+  - sudo ./setup.sh (this will take some time)
+  - ./train ~/PLEWI-polish-errors-correction-challenge 32000 4
+32000 is a number of BPE merge operations, 4 is a number of epochs