[skip ci] Edit README

README.md

@@ -1,9 +1,20 @@
-# Half-Life SDK for Xash3D
+# Half-Life SDK for Xash3D [![Build Status](https://travis-ci.org/FWGS/hlsdk-xash3d.svg)](https://travis-ci.org/FWGS/hlsdk-xash3d)
 
-Half-Life SDK for Xash3D with some fixes.
+Half-Life SDK for Xash3D & GoldSource with some fixes.
 
 ## How to build
 
+### CMake as most universal way
+
+```
+mkdir build && cd build
+cmake ../
+```
+
+You may enable or disable some build options by -Dkey=value. All available build options are defined in CMakeLists.txt at root directory.
+
+See below, if CMake is not suitable for you:
+
 ### Windows
 
 TODO
@@ -25,3 +36,7 @@ TODO
     gmake CXX=clang++ CC=clang
 ```
 
+### Android
+
+Just typical `ndk-build`.
+