add informational EIP for DAO HF

EIPS/eip-779.md

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+## Preamble
+
+    EIP: 779
+    Title: Hardfork Info: DAO Fork
+    Author: Casey Detrio
+    Type: Informational
+    Status: Final
+    Created: 2017-11-26
+
+## Abstract
+
+This documents the changes included in the hard fork named "DAO Fork". Unlike other hard forks, the DAO Fork did not change the protocol; all EVM opcodes, transaction format, block structure, and so on remained the same. Rather, the DAO Fork was an "irregular state change" that transferred ether balances from a list of accounts ("child DAO" contracts) into a specified account (the "WithdrawDAO" contract).
+
+## Specification
+
+- Codename: DAO Fork
+- Activation:
+  - Block == 1,920,000 on Mainnet
+
+See references [1] and [2] for the original, full specification. It is summarized here for convenience.
+
+At block 1880000, the following accounts are encoded into a list `L`:
+* The DAO (`0xbb9bc244d798123fde783fcc1c72d3bb8c189413`)
+* its extraBalance (`0x807640a13483f8ac783c557fcdf27be11ea4ac7a`)
+* all children of the DAO creator (`0x4a574510c7014e4ae985403536074abe582adfc8`) 
+* and the extraBalance of each child
+
+At the beginning of block 1920000, all ether throughout all accounts in `L` will be transferred to a contract deployed at `0xbf4ed7b27f1d666546e30d74d50d173d20bca754`. The contract was created from the following Solidity code (compiler version `v0.3.5-2016-07-01-48238c9`):
+
+```
+// Deployed on mainnet at 0xbf4ed7b27f1d666546e30d74d50d173d20bca754
+
+contract DAO {
+    function balanceOf(address addr) returns (uint);
+    function transferFrom(address from, address to, uint balance) returns (bool);
+    uint public totalSupply;
+}
+
+contract WithdrawDAO {
+    DAO constant public mainDAO = DAO(0xbb9bc244d798123fde783fcc1c72d3bb8c189413);
+    address public trustee = 0xda4a4626d3e16e094de3225a751aab7128e96526;
+
+    function withdraw(){
+        uint balance = mainDAO.balanceOf(msg.sender);
+
+        if (!mainDAO.transferFrom(msg.sender, this, balance) || !msg.sender.send(balance))
+            throw;
+    }
+
+    function trusteeWithdraw() {
+        trustee.send((this.balance + mainDAO.balanceOf(this)) - mainDAO.totalSupply());
+    }
+}
+```
+
+## References
+
+1. https://blog.slock.it/hard-fork-specification-24b889e70703
+2. https://blog.ethereum.org/2016/07/15/to-fork-or-not-to-fork/
+
+## Copyright
+
+Copyright and related rights waived via [CC0](https://creativecommons.org/publicdomain/zero/1.0/).