Begin stubbing out the shared library.

README.adoc

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+= External Artifacts
+
+This link:https://jenkins.io/doc/book/pipeline/shared-libraries[Pipeline Shared Library]
+performs an
+link:http://unethicalblogger.com/2017/08/03/overriding-builtin-steps-pipeline.html[override]
+of the built-in `archive` and `archiveArtifacts` steps to provide external
+artifact storage.

vars/archive.groovy

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+/*
+ * archive - override the built-in `archive` step.
+ *
+ * This is just a support shim to pass off to the "real" step worth overriding:
+ * archiveArtifacts
+ */
+
+def call(Map args) {
+    assert args.includes
+    return archiveArtifacts(artifacts: args.includes, excludes: args.excludes)
+}
+
+def call(String includes) {
+    return call(includes: includes)
+}

vars/archiveArtifacts.groovy

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+/*
+ * archiveArtifacts- override the built-in `archiveArtifacts` step.
+ */
+
+def call(Map args) {
+    assert args.artifacts
+    echo args
+}
+
+def call(String artifacts) {
+    return call(artifacts: includes)
+}