sensortemplate: Added a template sensor

The purpose of the templatesensor is to get contributors up and running
faster when adding a new sensor.

    * Created library named 'sensortemplate'
    * Added C++ source
    * Added swig interface files for java, javascript, and python
    * Added sensortemplate image file
    * Added examples for c++, java, javascript, and python
    * Updated contributions.md with steps to create a new sensor from
      the sensortemplate library.

Signed-off-by: Noel Eck <noel.eck@intel.com>

examples/python/sensortemplate.py

@@ -0,0 +1,42 @@
+# The MIT License (MIT)
+#
+# Author: Your Full Name <your@email.address>
+# Copyright (c) <year> <copyright holder>
+#
+# Author: <contributing author full name - if applicable>
+# Copyright (c) <year> <copyright holder>
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy of
+# this software and associated documentation files (the "Software"), to deal in
+# the Software without restriction, including without limitation the rights to
+# use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+# the Software, and to permit persons to whom the Software is furnished to do so,
+# subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+# FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+# COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+# IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+
+from __future__ import print_function
+import time
+from upm import pyupm_sensortemplate
+
+def main():
+    # Create an instance of SensorTemplate
+    sensor = pyupm_sensortemplate.SensorTemplate(0)
+
+    while True:
+        print("SensorTemplate says: %s" % sensor.helloWorld)
+
+        # Repeat every 2 seconds
+        sleep(2)
+
+if __name__ == '__main__':
+    main()