Create CODING_STYLE.md

CODING_STYLE.md

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+# IndustrialTest coding style guidelines
+## Indenting
+You should use tabs for indentation.
+
+## Naming convention
+Use `lowerCamelCase` for functions, variables and table keys. Use `UPPER_SNAKE_CASE` for constants and `lower_snake_case` for filenames.
+
+## Other
+If table contains one element then it can be inlined:
+```lua
+someTable={element}
+```
+or:
+```
+someTable={key=element}
+```
+however if it contains more than one element then each element should go on separate line:
+```lua
+someTable={
+    element1,
+    element2
+}
+```
+or:
+```lua
+someTable={
+    key=element1,
+    key2=element2
+}
+```