Merge pull request #495 from Joystream/mochet-patch-2

Create minimum_stake_requirements.md

governance/minimum_stake_requirements.md

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+This file contains the `minimum stake requirements` that the council has agreed upon for each role. Higher stake requirements can be used, but when hiring leads or workers, these minimum requirements should be fulfilled.
+
+Minimum Lead Stake - 500000 JOY
+
+Minimum Worker Stake - 100000 JOY