First pass conversion of NAV Patterns

content/NAVPatterns/class-coupling/index.md

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+title = "class-coupling.md"
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+Do not write functions that have high class coupling. This makes the code hard to maintain.
+
+Bad code
+
+    Any procedure / trigger that has class coupling of \> 30  
+      
+    
+
+Good code
+
+    Any procedure / trigger that has class coupling of <= 30\.
+    Class coupling is computed by summing the unique instances of the following in a code block:
+    - every unique usage of a complex C/AL data type (table, codeunit, etc) as 1\.
+    - every unique usage of a DotNet type as 1\.