Add Setup instructions

[konnraad]

discussed with @flovogt

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[flovogt]

@matz3 and @randombyte, should we promote global installation or should we try to use npx in this case? In the UI5 Tooling documentation https://sap.github.io/ui5-tooling/v4/pages/GettingStarted/ we recommend global installation but i guess at that point in time npx was not yet available.

[matz3]

@matz3 and @RandomByte, should we promote global installation or should we try to use npx in this case? In the UI5 Tooling documentation https://sap.github.io/ui5-tooling/v4/pages/GettingStarted/ we recommend global installation but i guess at that point in time npx was not yet available.

Typically the command is used more than just once. Therefore, I would still expect that one global install is more user-friendly than having to use npx @ui5/cli something instead of ui5 something every time. But of course, both are valid.

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