samples: Mention Gradle build in READMEs

samples/csvparser/README.md

@@ -5,6 +5,7 @@ A sample data [European Mammals Red List for 2009] (https://data.europa.eu/euodp
 from EU is being used.
 
 To build use `./build.sh` script without arguments (or specify `TARGET` variable if cross-compiling).
+You also may use Gradle to build this sample: `../gradlew build`.
 
 To run use
 

samples/gitchurn/README.md

@@ -4,6 +4,7 @@
 libgit2 is required for this to work (`apt-get install libgit2-dev`).
 
 To build use `./build.sh` script without arguments (or specify `TARGET` variable if cross-compiling).
+You also may use Gradle to build this sample: `../gradlew build`.
 
 To run use
 

samples/libcurl/README.md

@@ -2,6 +2,7 @@
 
  This example shows how to communicate with libcurl, HTTP/HTTPS/FTP/etc client library.
 To build use `./build.sh` script without arguments (or specify `TARGET` variable if cross-compiling).
+You also may use Gradle to build this sample: `../gradlew build`.
 
 To run use
 

samples/opengl/README.md

@@ -4,6 +4,7 @@
 MacOS shall work as is.
 
 To build use `./build.sh` script without arguments (or specify `TARGET` variable if cross-compiling).
+You also may use Gradle to build this sample: `../gradlew build`.
 
 To run use
 

samples/socket/README.md

@@ -4,6 +4,10 @@ Compile the echo server (in EAP only supported on Mac host):
 
     ./build.sh
 
+You also may use Gradle to build the server:
+
+    ../gradlew build
+
 Run the server:
 
     ./EchoServer.kexe 3000 &

samples/tetris/README.md

@@ -11,13 +11,26 @@ Install SDL2 development files (see https://www.libsdl.org/download-2.0.php). Fo
 copy `SDL2.framework` to `$HOME/Library/Frameworks`. For Debian-like Linux -
 use `apt-get install libsdl2-dev`.
 
-To build Tetris application for your host platform use
+To build Tetris application for your host platform use 
-	./build.sh
+    
-note that SDL2 must be installed on the host.
+    ./build.sh
+ 
+You also may use gradle to build this sample: `../gradlew buildMacbook` or `../gradlew buildLinux`.
+Note that SDL2 must be installed on the host.
+
 For cross-compilation to iOS (on Mac host) use
+
 	TARGET=iphone ./build.sh
+or
+    
+    ../gradlew buildIphone
+    
 For cross-compilation to Raspberry Pi (on Linux host) use
+
 	TARGET=raspberrypi ./build.sh
+or
+
+    ../gradlew buildRaspberry
 
 During build process compilation script creates interoperability bindings to SDL2, using SDL C headers,
 and then compiles an application with the produced bindings.