[docs] setup documents

docs/user/setup/docs.user.setup.global_defaults.md

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+---
+{
+	"_label": "Global Default"
+}
+---
+Default means automatic. Something that is predefined in the system settings, occurs without change or effort, if you do not choose another option.
+
+For example, If you deal in the currency-Rupee, you can set your default global setting as Rupee. Whenever a transaction takes place in ERPNext, the system will automatically consider Rupee as the default medium of currency, unless you specify otherwise.
+
+
+> Setup > Tools > Global Settings/Defaults
+
+
+
+![Global Defaults](img/global-defaults.png)
+
+
+
+