Is there a purpose of the Existance/Creation?

There are no obligations for me in this world. There are nothing to be obtained, or unobtainable therof, for me.

न मे पार्थास्ति कर्तव्यं त्रिषु लोकेषु किञ्चन ।
नानवाप्तमवाप्तव्यं वर्त एव च कर्मणि ॥३:२२॥

Lord Krishna says to Arjun:
There is not any obligation for me, O Paartha (Arjun), in the three worlds. Also, I have nothing to obtain or there is really anything unobtainable to me, but I am always in action.

You can't, at any moment, remain without taking some kind of actions.

न हि कश्चित्क्षणमपि जातु तिष्ठत्यकर्मकृत् ।
कार्यते ह्यवशः कर्म सर्वः प्रकृतिजैर्गुणैः ॥३:५॥

Lord Krishna says to Arjun:
One cannot remain without action at any moment, indeed not at all. Indeed, everyone born of the nature do some kind of action spontaneously (without their control) due to the inherent characteristics of the nature they are born of.

If I don't do anything, the humans will follow me (and stop working).

यदि ह्यहं न वर्तेयं जातु कर्मण्यतन्द्रितः ।
मम वर्त्मानुवर्तन्ते मनुष्याः पार्थ सर्वशः ॥३:२३॥

Lord Krishna says to Arjun:
If ever, O Paartha (Arjun), I am not engaged carefully in actions, the humans will indeed follow my path entirely.

I do not taint the (peoples') actions, nor do I aspire to the fruits (results) of actions.

न मां कर्माणि लिम्पन्ति न मे कर्मफले स्पृहा ।
इति मां योऽभिजानाति कर्मभिर्न स बध्यते ॥४:१४॥

Lord Krishna says to Arjun:
I do not taint the actions, nor do I have aspirations for fruits of actions. So, he who knows me by actions, is not bonded.