docs: Effective Gno

Signed-off-by: Manfred Touron <94029+moul@users.noreply.github.com>

docs/effective-gno.md

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+# Effective Gno
+
+This document provides advice and guidelines for writing effective Gno code.
+
+## Formatting
+
+### Indentation
+
+Use 4 spaces for each level of indentation. Avoid using tabs.
+
+```gno
+func main() {
+    fmt.Println("Hello, World!")
+}
+```
+
+### Braces
+
+The opening brace should be on the same line as the function declaration.
+
+```gno
+func hello() {
+    // code here
+}
+```
+
+## Comments
+
+### Inline Comments
+
+Use `//` for inline comments.
+
+```gno
+var a = 1 // This is an inline comment
+```
+
+### Block Comments
+
+For longer descriptions, use `/* ... */`.
+
+```gno
+/*
+This is a longer comment that
+spans multiple lines.
+*/
+```
+
+## Variables
+
+### Declaration
+
+Declare variables using the `var` keyword.
+
+```gno
+var x int = 10
+```
+
+You can also declare multiple variables at once:
+
+```gno
+var (
+    a = 1
+    b = 2
+)
+```
+
+### Naming
+
+Use camelCase for variable names.
+
+```gno
+var myVariable = "hello"
+```
+
+## Functions
+
+### Declaration
+
+Declare functions using the `func` keyword.
+
+```gno
+func myFunction() {
+    // code here
+}
+```
+
+### Parameters
+
+Function parameters should be declared in the function signature.
+
+```gno
+func add(a int, b int) int {
+    return a + b
+}
+```
+
+### Return Values
+
+Functions can return multiple values.
+
+```gno
+func divmod(a int, b int) (int, int) {
+    return a / b, a % b
+}
+```
+
+### Error Handling
+
+Use errors for exception handling.
+
+```gno
+func doSomething() error {
+    // if something goes wrong
+    return errors.New("Something went wrong")
+}
+```
+
+## Control Structures
+
+### If Statements
+
+If statements do not need parentheses around the condition.
+
+```gno
+if condition {
+    // code here
+}
+```
+
+### For Loops
+
+Gno uses the `for` keyword for loops.
+
+```gno
+for i := 0; i < 10; i++ {
+    // code here
+}
+```
+
+For each loops are also supported.
+
+```gno
+for index, value := range array {
+    // code here
+}
+```
+
+## Structs
+
+Structs are used to group related data together.
+
+```gno
+type Person struct {
+    Name string
+    Age  int
+}
+```
+
+## Interfaces
+
+Interfaces are defined using the `interface` keyword.
+
+```gno
+type Reader interface {
+    Read(p []byte) (n int, err error)
+}
+```
+
+Remember, the key to effective Gno programming is practice. Write code, read code, and don't be afraid to ask for help. Happy coding!