Add basic description

README.md

@@ -1,2 +1,22 @@
 # NetworkMapper
 Android frontend for Nmap Security Scanner
+
+Network Mapper is Android frontend for well known Nmap scanner. Frontend will help you to download and install nmap as well as use it. 
+
+Frontend supports all known Android architectures: arm, mips and x86. 
+
+Network Mapper is released under open source license and source is available on GitHub.
+
+# Build
+
+Clone repository, change directory to project and issue following command:
+
+ANDROID_HOME=/opt/Android/Sdk gradle build
+
+You can check other tasks available:
+
+ANDROID_HOME=/opt/Android/Sdk gradle tasks
+
+Note: you must have gradle version 2 or higher 
+
+