Added Roadmap

Added a roadmap stating our targeted goals for SGMiner-GM.

roadmap.md

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+This project is being *actively* developed by Wolf and OhGodAGirl on behalf of Genesis Mining. Here's our projected timeline - this is not set in stone, and will be updated to keep the community updated.
+
+### November, 2016
+
++ Integrate ZCash Miner with Stratum Support
++ Polish and Optimize SilentArmy
++ Add fan control and temperature monitoring,
++ Clean up, and combine, the ZCash, Ethereum and XMR branches.
+
+### December, 2016
+
++ Integrate optimized kernels for AES, Shabal, Groestl and Echo.
++ Performance increases for ZCash, and XMR.
++ Bug Fixes.
+
+### January, 2017
+
++ Integrate optimized kernels for Cubehash, Fugue, Hamsi.
++ Integrate HODLCoin, Espers and LBRY.
++ Look into integrating community requests.
+
+### February, 2017
+
++ Integrate optimized kernels for JH, Luffa, Shavite.
++ Performance increases for various miners.
++ Integrate control and finetuning for voltage control and memory control for GPUs.
++ Add CPU mining
+
+### March, 2017
+
++ Integrate optimized kernels for SIMD, Skein, Whirlpool.
++ Performance increases and bug fixes.
++ Slow rewrite of SGMiner, replacing else/if statements with function pointers (in scanhash_opencl) and removing the various goto statements.
+
+### April, 2017
+
++ Create an updated manual for SGMiner-GM, including a detailed walkthrough of setting it up on various systems (Arch Linux, Linux Mint, Ubuntu, PiMP and EthOS).
++ Addition of a GUI for those who prefer it.
++ Performance increases for various kernels and coins.