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

Signed-off-by: Kiveisha Yevgeniy <yevgeniy.kiveisha@intel.com>

diff --git a/src/gas/README.txt b/src/gas/README.txt
new file mode 100644 (file)
index 0000000..a1d475d
--- /dev/null
+++ b/src/gas/README.txt
@@ -0,0 +1,6 @@
+Grove - Gas Sensor(MQ-2)：Combustible Gas、Smoke [middle sensitivity]
+Grove - Gas Sensor(MQ-3)：Alcohol and Benzine [HIGH sensitivity] Long warmup
+Grove - Gas Sensor(MQ-5)：LPG, Natural Gas, Town Gas [high sensitivity]
+Grove - Gas Sensor(MQ-9)：LPG, CO, CH4 [low sensitivity]
+
+Note - Gas sensor need to be heated, first minute the data is incorrect.