Create README.md

README.md

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+To compile and run these programs, you only need JDK 8 installed. 
+Invoking `gradlew` will automatically download and install Gradle.
+Gradle will also install all additional libraries necessary to compile
+and run the Java examples in the book.
+
+To compile everything, the command is:
+
+`gradlew build`
+
+To run everything (including compiling if necessary), the command is:
+
+`gradlew run`
+
+To compile only a single chapter (including dependencies), use for example:
+
+`gradlew :strings:build`
+
+To run only a single chapter, say:
+
+`gradlew :strings:run`