Update README.md

Author: djdeniro

README.md

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 # StorageProvider
 StorageProvider is app for get access to decentralized storage network
+
+## We created launcher app, to make test launch easy
+**Step to start**
+
+- [Download](https://github.com/DeNetPRO/StorageProvider/releases) (click to assets, and choose your OS)
+- Unpack 7z archive
+- Open “launcher”
+
+
+**Step to test (after you double clicked “launcher”)**
+
+- Import your test account or create new one (and save private key)
+- Play with storage (try to upload, download, remove files)
+- Wait for testnet updates and rewards
+
+# Video-guide
+
+[![Watch the video](https://img.youtube.com/vi/D0qoKiJDqaU/hqdefault.jpg)](https://youtu.be/D0qoKiJDqaU)
+
+# Warning!
+
+- Your tokens can be spent by ProofOfStorage, do not panic. It will be refunded automatically in the nearest time.
+- If you found bug, report about it using [Testnet BugTracker Form](https://docs.google.com/forms/d/e/1FAIpQLSfScWv2q7Y2X_cXq69anDdrC4v4aRsm9glXSVs21VntNTacSQ/viewform)
+- Files larger than 400 MB can take a long time to load (or got some errors)
+- Public testnet has logging (accounts count, files count, total storage size, errors log (without addresses and private keys))
+- If you share your experience in our chat, we will grow faster and we will prepare to launch MainNet faster!`