Add Go var vs := content

src/data/roadmaps/golang/content/var-vs@pJUkMcrUvcxuR_w89-eEq.md

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-# var vs :=
+# var vs :=
+
+Go provides two main ways to declare variables: using `var` and using the short declaration operator `:=`.
+
+The `var` keyword is used for explicit variable declarations. You can use it to define a variable with or without assigning a value. If no value is provided, Go assigns a default *zero value* based on the variable type. `var` can be used both inside and outside functions.
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+The `:=` syntax is a shorthand for declaring and initializing a variable. It infers the type from the value and can only be used **inside functions**. This is a quick and convenient way to create variables without explicitly mentioning their types.
+
+Visit the following resources to learn more:
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+- [@official@Go Tour: Short variable declarations](https://go.dev/tour/basics/10)
+- [@official@Go Specification: Short Variable Declarations](https://go.dev/ref/spec#Short_variable_declarations)
+