Added coding-style.md

doc/coding-style.md

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+Coding Style
+===============
+
+In order to maintain a consistent style across the codebase, the following coding style has been adopted:
+
+- Function names use PascalCase (func SomeFunc()).
+- Function names using acronyms are capitilised (func SendHTTPRequest()).
+- Variable names use CamelCase (var someVar()).
+- Coding style uses gofmt.
+- Const variables are capitilised.
+- In line with gofmt, for loops and if statements don't require paranthesis.
+
+Block style example:
+```go
+func SendHTTPRequest(method, path string, headers map[string]string, body io.Reader) (string, error) {
+	result := strings.ToUpper(method)
+
+	if result != "POST" && result != "GET" && result != "DELETE" {
+		return "", errors.New("Invalid HTTP method specified.")
+	}
+
+	req, err := http.NewRequest(method, path, body)
+
+	if err != nil {
+		return "", err
+	}
+
+	for k, v := range headers {
+		req.Header.Add(k, v)
+	}
+ 	...
+}
+```