Prepare for open contribution

.editorconfig

@@ -0,0 +1,20 @@
+# EditorConfig helps developers define and maintain consistent
+# coding styles between different editors and IDEs
+# editorconfig.org
+
+root = true
+
+[*]
+# Change these settings to your own preference
+indent_style = space
+indent_size = 4
+
+# We recommend you to keep these unchanged
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+# Markdown files sometimes need trailing whitespaces.
+[*.md]
+trim_trailing_whitespace = false

.github/CODE_OF_CONDUCT.md

@@ -0,0 +1,5 @@
+# Code of Conduct
+
+In order to foster a more inclusive community, Gradle has adopted the [Contributor Covenant](https://www.contributor-covenant.org/version/1/4/code-of-conduct/).
+
+Contributors must follow the Code of Conduct outlined at [https://gradle.org/conduct/](https://gradle.org/conduct/).

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,22 @@
+<!--- Provide a brief summary of the issue in the title above -->
+
+### Expected Behavior
+<!--- If you're describing a bug, tell us what should happen -->
+<!--- If you're suggesting a change/improvement, tell us how it should work -->
+
+### Current Behavior
+<!--- If describing a bug, tell us what happens instead of the expected behavior -->
+<!--- If suggesting a change/improvement, explain the difference from current behavior -->
+
+### Context
+<!--- How has this issue affected you? What are you trying to accomplish? -->
+<!--- Providing context helps us come up with a solution that is most useful in the real world -->
+
+### Steps to Reproduce (for bugs)
+<!--- Provide a self-contained example project (as an attached archive or a Github project). -->
+<!--- In the rare cases where this is infeasible, we will also accept a detailed set of instructions. -->
+
+### Your Environment
+<!--- Include as many relevant details about the environment you experienced the bug in -->
+<!--- A build scan `https://scans.gradle.com` is ideal -->
+ * Build scan URL: 

docs/README.adoc

@@ -266,3 +266,11 @@ For example, you might prepend a `Command` that sets up some environment before
 === Custom Gradle installation
 
 To allow Gradle itself to run using test versions of Gradle, the `GradleSamplesRunner` allows a custom installation to be injected using the system property "integTest.gradleHomeDir".
+
+=== Contributing
+
+[link=https://builds.gradle.org/viewType.html?buildTypeId=Build_Tool_Services_Exemplar]
+image::https://builds.gradle.org/guestAuth/app/rest/builds/buildType:(id:Build_Tool_Services_Exemplar)/statusIcon.svg[Build status]
+
+[link=https://gradle.org/conduct/]
+image::https://img.shields.io/badge/code%20of-conduct-lightgrey.svg?style=flat&colorB=ff69b4[code of conduct]