Introduce a guide to tasks created by the plugin: docs/tasks-overview.md

Author: Abduqodiri Qurbonzoda

docs/tasks-overview.md

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+## Overview of Tasks Provided by kotlinx-benchmark Gradle Plugin
+
+The kotlinx-benchmark plugin creates different Gradle tasks depending on how it is configured.
+For each pair of configuration profile and registered target a task is created to execute that profile on the respective platform.
+To learn more about configuration profiles, refer to [configuration-options.md](configuration-options.md).
+
+### Example Configuration
+
+To illustrate, consider the following `kotlinx-benchmark` configuration:
+
+```kotlin
+// build.gradle.kts
+benchmark {
+    configurations {
+        named("main") {
+            iterations = 20
+            warmups = 20
+            iterationTime = 1
+            iterationTimeUnit = "s"
+        }
+        register("smoke") {
+            include("Essential")
+            iterations = 10
+            warmups = 10
+            iterationTime = 200
+            iterationTimeUnit = "ms"
+        }
+    }
+
+    targets {
+        register("jvm")
+        register("js")
+    }
+}
+```
+
+## Tasks for the "main" Configuration Profile
+
+- **`benchmark`**:
+    - Runs benchmarks within the "main" profile for all registered targets. 
+    - In our example, `benchmark` runs benchmarks within the "main" profile in both `jvm` and `js` targets.
+
+- **`<targetName>Benchmark`**:
+    - Runs benchmarks within the "main" profile for a particular target.
+    - In our example, `jvmBenchmark` runs benchmarks within the "main" profile in the `jvm` target, while `jsBenchmark` runs them in the `js` target.
+
+## Tasks for Custom Configuration Profiles
+
+- **`<configName>Benchmark`**:
+    - Runs benchmarks within `<configName>` profile in all registered targets.
+    - In our example, `smokeBenchmark` runs benchmarks within the "smoke" profile.
+
+- **`<targetName><configName>Benchmark`**:
+    - Runs benchmarks within `<configName>` profile in `<targetName>` target.
+    - In our example, `jvmSmokeBenchmark` runs benchmarks within the "smoke" profile in `jvm` target while `jsSmokeBenchmark` runs them in `js` target.
+
+## Other useful tasks
+
+- **`<targetName>BenchmarkJar`**:
+    - Created only when a Kotlin/JVM target is registered for benchmarking.
+    - Produces a self-contained executable JAR file in `build/benchmarks/<targetName>/jars/` directory of your project that contains your benchmarks in `<targetName>` target, and all essential JMH infrastructure code.
+    - The JAR file can be run using `java -jar path-to-the.jar` command with relevant options. Run with `-h` to see the available options.
+    - The JAR file can be used for running JMH profilers.
+    - In our example, `jvmBenchmarkJar` produces a JAR file in `build/benchmarks/jvm/jars/` directory that contains benchmarks in `jvm` target.