Update README.md

README.md

@@ -99,6 +99,7 @@ DATA SET DESCRIPTION
 
 Each data set consists of 8 fields, each of which is separated by the concatenation character, i.e. the vertical bar ("|"). The fields contain the following data:
 
+```
 Field 1: Type of coding
 
 0 = pure reference set
@@ -109,6 +110,7 @@ but rather references to other terms within the text field,
 
 under which their key numbers are shown.
 
+
 1 = Coding with only one primary key number
 2 = Coding with one cross and one star key number
 3 = Coding with one primary key number and with
@@ -126,3 +128,4 @@ Field 6: Additional key number (with an exclamation mark)
 Field 7: Primary key number 2 (if applicable with a cross)
 Field 8: associated text, if applicable with reference
 This file is intended for integration into diagnosis coding programs.
+```