Add gradle files

gradle/git-hooks.gradle

+apply plugin: "com.star-zero.gradle.githook"
+
+/**
+ * Add Git hooks on pre commit and pre push.
+ *
+ * See https://github.com/STAR-ZERO/gradle-githook
+ */
+githook {
+  createHooksDirIfNotExist = true
+
+  hooks {
+    "pre-push" {
+      task = "markdownlint yamllint spotlessCheck spotbugsMain spotbugsTest"
+    }
+  }
+}

gradle/node.gradle

+apply plugin: "com.github.node-gradle.node"
+
+node {
+  download = true
+  version = "${nodeVersion}"
+}
+
+/* Install markdownlint-cli with NPM */
+task nodeInstall(type: NpmTask) {
+  description "Install markdownlint-clia and yamllint with NPM"
+  args = [
+    "install",
+    "markdownlint-cli",
+    "yaml-lint",
+    "--save-dev",
+    "--loglevel",
+    "error"
+  ]
+}
+
+/* Run markdownlint */
+task markdownlint(type: NpxTask) {
+  description "Run markdownlint"
+  dependsOn nodeInstall
+  command = "markdownlint"
+  args = ["**/*.md"]
+}
+
+/* Apply markdownlint fixes */
+task markdownlintApply(type: NpxTask) {
+  description "Apply markdownlint fixes"
+  dependsOn nodeInstall
+  command = "markdownlint"
+  args = [
+    "**/*.md",
+    "--fix",
+  ]
+}
+
+/* Run yamllint */
+task yamllint(type: NpxTask) {
+  description "Run yamllint"
+  dependsOn nodeInstall
+  command = "yamllint"
+  args = [
+    "**/*.yml",
+    "--ignore=.gradle/**",
+    "--ignore=node_modules/**",
+  ]
+}

gradle/spotbugs-filter.xml

+<FindBugsFilter>
+
+  <!-- Caused by Java 11 generating a null check on try with resources. This
+    passed on Java 8 -->
+  <Match>
+    <Bug pattern="RCN_REDUNDANT_NULLCHECK_WOULD_HAVE_BEEN_A_NPE" />
+  </Match>
+
+  <!-- StringConverter.INSTANCE.convert(this) will never be null -->
+  <Match>
+    <Class name="gov.usgs.earthquake.nshmp.geo.Location" />
+    <Method name="toString" />
+    <Bug code="NP" />
+  </Match>
+
+  <!-- https://spotbugs.readthedocs.io/en/stable/filter.html#rank -->
+  <!-- TODO can we change this to higher rank or remove all together? -->
+  <Match>
+    <Rank value="16" />
+  </Match>
+
+  <!-- Example exclude class -->
+  <!-- <Match> -->
+  <!-- <Class name="gov.usgs.earthquake.nshmp.eq.fault.Faults" /> -->
+  <!-- </Match> -->
+
+</FindBugsFilter>

gradle/spotbugs.gradle

+apply plugin: "com.github.spotbugs"
+
+/*
+ * Configure SpotBugs (FindBugs successor).
+ *
+ * See https://spotbugs.readthedocs.io
+ */
+spotbugs {
+  excludeFilter = file("${projectDir}/gradle/spotbugs-filter.xml")
+  effort = "max"
+}

gradle/spotless.gradle

+apply plugin: "com.diffplug.spotless"
+
+/*
+ * Configure Spotless for code formatting checks based on the
+ * nshmp eclispe formatter (src/resources/nshmp.eclipse-format.xml).
+ *
+ * Spotless formatting check (spotlessCheck) is automatically
+ * ran on the pre-commit and pre-push git hooks.
+ *
+ * To fix any formatting issues run ./gradlew spotlessApply.
+ *
+ * See https://github.com/diffplug/spotless/tree/master/plugin-gradle
+ */
+spotless {
+
+  /* Java formatting */
+  java {
+    targetExclude "**/build", "bin", "**/Scratch*.java", "tmp", "libs"
+
+    removeUnusedImports()
+
+    custom "Refuse wildcard imports", {
+      if (it =~ /\nimport .*\*;/) {
+        throw new Error("Do not use wildcard imports. 'spotlessApply' cannot resolve this issue.");
+      }
+    }
+
+    importOrderFile "${projectDir}/src/main/resources/eclipse.importorder"
+    eclipse().configFile "${projectDir}/src/main/resources/nshmp.eclipse-format.xml"
+
+    trimTrailingWhitespace()
+    indentWithSpaces(2)
+    endWithNewline()
+  }
+
+  /* Gradle file formatting */
+  groovyGradle {
+    target "**/*.gradle"
+    targetExclude "**/build", ".gradle", "bin", "tmp"
+    greclipse()
+    trimTrailingWhitespace()
+    indentWithSpaces(2)
+    endWithNewline()
+  }
+
+  /* .gitignore, Bash, and Dockerfile formatting */
+  format "misc", {
+    target "**/.gitgnore", "**/*.sh", "**/*Dockerfile"
+    targetExclude "**/build", ".gradle/**", ".settings", "tmp/**",
+        "libs/**", "node_modules"
+    trimTrailingWhitespace()
+    indentWithSpaces(2)
+    endWithNewline()
+    replaceRegex "Too many blank lines", "^\\n\\n+", "\n"
+  }
+
+  /* XML formatting */
+  format "xml", {
+    target fileTree(".") {
+      include "**/*.xml"
+      exclude "**/build", ".settings", ".classpath", ".project",
+          "tmp/**", ".gradle/**", "libs/**", "node_modules"
+    }
+    eclipseWtp("xml")
+    trimTrailingWhitespace()
+    indentWithSpaces(2)
+    endWithNewline()
+  }
+}

src/main/resources/eclipse.importorder

+#Organize Import Order
+0=java
+1=javax
+2=org
+3=com
+4=gov
+5=ucar