JS first part

JS/README.md

+# EasyRedmine JavaScript guidelines
+ Main goal of this document is to highlight rules and recommendations for creation nice and maintainable JavaScript code.
+ 
+## Rules strength
+ Rules described here comes at three different strengths.
+ - DO or DON'T are mandatory for any Javascript code and it is valid reason for rejection of a merge request if not followed.
+ - PREFER of AVOID is rules that should by followed but they are mandatory only for core implementation. 
+ - CONSIDER are not mandatory, but it makes the reviewer happy if they are followed 
+## Default rules
+ Code style defined in this document is based on W3C standard conventions:
+ 
+ [JavaScript Coding Conventions](https://www.w3schools.com/js/js_conventions.asp)
+ 
+ [JavaScript Best Practices](https://www.w3schools.com/js/js_best_practices.asp)
+ 
+ Exceptions from this coding styles will be described further 
+ 
+## Naming
+- DO name common variables with lowerCamelCase style. DON'T use snake_case or hyphens.
+- DO name classes with UpperCamelCase.
+- CONSIDER naming Constant also with lowerCamelCase
+- DO name variables with descriptive names, not by short variables as 'a'.
+
+## Indentation + spaces
+- DO use spaces instead tabulators
+- PREFER use spaces around operators ( = + - * / ), and after commas:
+- PREFER use 2 spaces as a 1 indentation step
+- PREFER use 4 spaces for continuation of previous line (if it is too long)
+
+# Blocks
+To prevent appearance of the pyramid of hell, this rules are given:
+- DO use at most 4 level of indentation.
+You can use control statements to flatten the structure 
+```javascript
+// BAD
+for (var i = 0; i < 10; i++) {
+  if (i % 2 === 0) {
+    for (var j = 0; j < 10; j++) {
+      if (j !== i) {
+        // -- do something
+      }
+    }
+  }
+}
+// GOOD
+for (var i = 0; i < 10; i++) {
+  if (i % 2 !== 0) continue;
+  for (var j = 0; j < 10; j++) {
+    if (j === i) continue;
+    // -- do something
+  }
+}
+```
+- AVOID defining callback in callback
+- AVOID using very short blocks
+```javascript
+var a = 5;
+// BAD
+if (a === 5) {
+  return;
+}
+// GOOD
+if (a === 5) return;
+```
+- DON'T use multiline `if` statement without `{}`
\ No newline at end of file

README.md

@@ -5,6 +5,7 @@
 3. Licence
 4. [UI Guide](./UI/README.md)
 5. [DEV Guide](./DEV/README.md)
+6. [JS Guide](./JS/README.md)
 
 Easy Software Ltd.  
 https://www.easysoftware.com