[doc] Create install instructions. Resolves #171

INSTALL.org

@@ -0,0 +1,28 @@
+#+TITLE: Installing Communi-Sailfish
+* Prerequisites
+
+Before you can anything else you should first install[fn:1] the Sailfish SDK (or Platform SDK) and have
+read the Sailfish Wiki about building packages[fn:2]
+
+* Building
+
+To build the app you just run sfkdk (Sailfish SDK):
+
+#+begin_src sh
+sfkdk build
+#+end_src
+
+Or mb2 (Platform SDK):
+
+#+begin_src sh
+mb2 build
+#+end_src
+
+
+* Installing
+
+Follow: https://docs.sailfishos.org/Tools/Sailfish_SDK/Deploying_packages/
+
+* Footnotes
+[fn:1] https://docs.sailfishos.org/Tools/Sailfish_SDK/Installation/
+[fn:2] https://docs.sailfishos.org/Tools/Sailfish_SDK/Building_packages