Added licence

LICENCE.md

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+THIS SOFTWARE WAS DEVELOPED AT THE ROCKY MOUNTAIN RESEARCH STATION (RMRS)
+MISSOULA FIRE SCIENCES LABORATORY BY EMPLOYEES OF THE FEDERAL GOVERNMENT
+IN THE COURSE OF THEIR OFFICIAL DUTIES. PURSUANT TO TITLE 17 SECTION 105
+OF THE UNITED STATES CODE, THIS SOFTWARE IS NOT SUBJECT TO COPYRIGHT
+PROTECTION AND IS IN THE PUBLIC DOMAIN. RMRS MISSOULA FIRE SCIENCES
+LABORATORY ASSUMES NO RESPONSIBILITY WHATSOEVER FOR ITS USE BY OTHER
+PARTIES,  AND MAKES NO GUARANTEES, EXPRESSED OR IMPLIED, ABOUT ITS QUALITY,
+RELIABILITY, OR ANY OTHER CHARACTERISTIC.
+
+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.