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gas:: added README file with MQ-N sensors type 

Signed-off-by: Kiveisha Yevgeniy <yevgeniy.kiveisha@intel.com>
Kiveisha Yevgeniy 10 years ago
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+Grove - Gas Sensor(MQ-2)：Combustible Gas、Smoke [middle sensitivity]
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+Grove - Gas Sensor(MQ-3)：Alcohol and Benzine [HIGH sensitivity] Long warmup
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+Grove - Gas Sensor(MQ-5)：LPG, Natural Gas, Town Gas [high sensitivity]
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+Grove - Gas Sensor(MQ-9)：LPG, CO, CH4 [low sensitivity]
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+Note - Gas sensor need to be heated, first minute the data is incorrect.