Create key_facts.rst

doc/key_facts.rst

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+Key Papyrus Network facts
+=========================
+
+This section presents key variables of Papyrus Network setup, which dApp developers need to know. 
+
+ChainId = 32328
+Block interval = 1s
+Native token for resource allocation = PPR
+Native token emission at genesis block = 1000000000 PPR
+Mining rewards = (1.5 * A) / 47 PPR per mined block, where A equals to the count of Authority Nodes
+Block gas limit = 210284448
+
+Unstaking lock period = 3 * 24 hours
+Maximum gas allocation allowed for an address for X PPR stake = 3 * 24 * X in wei * blockGasLimit * 60 * 60 / max(totalStake in wei, 1 wei)
+Hourly gas allocation for an address for X PPR stake = X in wei * blockGasLimit * 60 * 60 / max(totalStake in wei, 1 wei), 
+where blockGasLimit = block gas limit, totalStake = current total amount of PPRs staked
+
+New Authority Node voting period = 14 days
+Authority Node blacklist voting period = 5 days
+Minimum votes required for Authority Node candidate approval = 3 
+Maximum number of Authority Nodes and candidates each Authority Nodes can vote for = 7
+Vote withdrawal lock period = 14 days
+
+BIOS contract versioner address = 0x0000000000000000000000000000000000000022
+(see http://docs.papyrus.network/en/latest/doc/api/api-bios.html)
+
+Actual version of BIOS contract: 
+https://github.com/papyrusglobal/papyrus/blob/master/papyrus-stuff/contracts/Bios.sol
+
+Actual version of Papyrus Network User Agreement: 
+https://github.com/papyrusglobal/papyrus/blob/master/PNUA
+
+SHA-256 hash of Papyrus Network User Agreement verifiable in network BIOS contract:
+0x5c366dc1ffa995d93fae49888f1283d5e8429a372757f43af315a79e84cd1583
+
+Network explorer provided by Papyrus:
+https://explorer.papyrus.network
+
+MetaMask wallet extension for token staking and Authority Nodes voting provided by Papyrus:
+https://wallet.papyrus.network
+
+Network status page:
+https://status.papyrus.network
+
+HTTP RPC gateways provided by Papyrus:
+https://gateway.papyrus.network
+https://gateway2.papyrus.network