feat: added Gradle plugin

plugins/gradle/README.md

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+# Gradle plugin
+
+This plugin adds completions and aliases for [Gradle](https://gradle.org/).
+
+To use it, add `gradle` to the plugins array in your bashrc file:
+
+```bash
+plugins=(... gradle)
+```
+
+## Usage
+
+This plugin creates a function called `gradle-or-gradlew`, which is aliased
+to `gradle`, which is used to determine whether the current project directory
+has a gradlew file. If `gradlew` is present it will be used, otherwise `gradle`
+is used instead. Gradle tasks can be executed directly without regard for
+whether it is `gradle` or `gradlew`. It also supports being called from
+any directory inside the root project directory.
+
+Examples:
+
+```bash
+gradle test
+gradle build
+```

plugins/gradle/gradle.plugin.sh

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+#! bash oh-my-bash.module
+
+function gradle-or-gradlew() {
+  # find project root
+  # taken from https://github.com/gradle/gradle-completion
+  local dir="$PWD" project_root="$PWD"
+  while [[ "$dir" != / ]]; do
+    if [[ -x "$dir/gradlew" ]]; then
+      project_root="$dir"
+      break
+    fi
+    dir="${dir:h}"
+  done
+
+  # if gradlew found, run it instead of gradle
+  if [[ -f "$project_root/gradlew" ]]; then
+    echo "executing gradlew instead of gradle"
+    "$project_root/gradlew" "$@"
+  else
+    command gradle "$@"
+  fi
+}
+
+alias gradle=gradle-or-gradlew