📝 Adds documentation for clean dataset

CLEAN.md

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+# Clean dataset
+
+The cleaned dataset will have the following structure:
+
+| Index | Name       | Type  | Range |
+|-------|------------|-------|-------|
+| 0     | Grade      | int   | [1-5] |
+| 1     | Sex        | enum  | [0-1] |
+| 2     | GPA        | float | [1-5] |
+| 3     | Math       | int   | [1-5] |
+| 4     | Slovak     | int   | [1-5] |
+| 5     | English    | int   | [1-5] |
+| 6     | Occupation | enum  | [0-5] |
+| 7     | Living     | enum  | [0-4] |
+| 8     | Commute    | enum  | [0-4] |
+| 9     | Absence    | int   | -     |
+
+### Sex
+
+```
+0 - zena
+1 - muz
+```
+
+### Occupation
+
+```
+0 - work hours / week >= 10
+1 - work hours / week < 10
+2 - sport
+3 - music
+4 - other
+5 - none
+```
+
+### Living
+
+```
+0 - with family
+1 - with family member
+2 - alone / roomates
+3 - dorms
+4 - other
+```
+
+### Commute
+
+```
+0 - dorms
+1 - <= 15m
+2 - <= 30m
+3 - <= 1h
+4 - > 1h
+```