Add BUILD, CONTRIBUTORS files

Author: fge

BUILD.md

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+## Preamble
+
+All instructions in this file use the Linux (or other Unix) conventions for
+build. If you happen to use Windows, replace `./gradlew` with `gradlew.bat`.
+
+## Building instructions
+
+### Gradle usage
+
+You may be fortunate enough that your IDE has Gradle support. Should it not
+be the case, first report a bug to your vendor; then refer to the cheat sheet
+below:
+
+```
+# List the list of tasks
+./gradlew tasks
+# Build, test the package
+./gradlew test
+# Install in your local maven repository
+./gradlew clean install
+```
+
+If you try and play around with Gradle configuration files, in order to be
+_really sure_ that your modifications are accounted for, add the
+`--recompile-scripts` option before the task name; for instance:
+
+```
+./gradlew --recompile-scripts test
+```
+
+## Note to Maven users
+
+There exists a possiblity to generate a `pom.xml` (using `./gradlew pom`), which
+is there for convenience. However, this is not supported by the author.
+

CONTRIBUTORS.md

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+## Randal Watler ([email protected])
+
+* "JSON Diff"
+