Add performance guide to trunk.
Add performance guide to trunk.

wolffcm/voltdb,simonzhangsm/voltdb,flybird119/voltdb,deerwalk/voltdb,creative-quant/voltdb,migue/voltdb,paulmartel/voltdb,VoltDB/voltdb,wolffcm/voltdb,ingted/voltdb,simonzhangsm/voltdb,flybird119/voltdb,flybird119/voltdb,kumarrus/voltdb,kumarrus/voltdb,kobronson/cs-voltdb,kobronson/cs-voltdb,kumarrus/voltdb,zuowang/voltdb,creative-quant/voltdb,wolffcm/voltdb,wolffcm/voltdb,creative-quant/voltdb,VoltDB/voltdb,flybird119/voltdb,creative-quant/voltdb,ingted/voltdb,kobronson/cs-voltdb,paulmartel/voltdb,zuowang/voltdb,deerwalk/voltdb,wolffcm/voltdb,flybird119/voltdb,flybird119/voltdb,paulmartel/voltdb,zuowang/voltdb,zuowang/voltdb,paulmartel/voltdb,kobronson/cs-voltdb,migue/voltdb,VoltDB/voltdb,kobronson/cs-voltdb,VoltDB/voltdb,paulmartel/voltdb,wolffcm/voltdb,deerwalk/voltdb,migue/voltdb,deerwalk/voltdb,kumarrus/voltdb,migue/voltdb,paulmartel/voltdb,kumarrus/voltdb,simonzhangsm/voltdb,kumarrus/voltdb,kobronson/cs-voltdb,creative-quant/voltdb,creative-quant/voltdb,simonzhangsm/voltdb,creative-quant/voltdb,ingted/voltdb,zuowang/voltdb,simonzhangsm/voltdb,simonzhangsm/voltdb,ingted/voltdb,kobronson/cs-voltdb,zuowang/voltdb,deerwalk/voltdb,VoltDB/voltdb,flybird119/voltdb,flybird119/voltdb,deerwalk/voltdb,deerwalk/voltdb,zuowang/voltdb,kobronson/cs-voltdb,creative-quant/voltdb,VoltDB/voltdb,migue/voltdb,VoltDB/voltdb,ingted/voltdb,simonzhangsm/voltdb,paulmartel/voltdb,migue/voltdb,ingted/voltdb,wolffcm/voltdb,ingted/voltdb,zuowang/voltdb,kumarrus/voltdb,wolffcm/voltdb,simonzhangsm/voltdb,migue/voltdb,migue/voltdb,deerwalk/voltdb,kumarrus/voltdb,ingted/voltdb,paulmartel/voltdb