[snapshot] Create minimal detection_rules package

[rw-access]

This is the start of a detection_rules package.
Related to https://github.com/elastic/security-team/issues/17

Includes

• kibana/rules/rule-*.json: Individual rules as separate files
• kibana/rules/changelog.json: Complete changelog for all rules in the package
• manifest.yml: Specifies the package metadata, uses a non-integration package type and marks the package as experimental.

When the format is stabilized and the package is ready to be promoted, a follow on PR will be created to elastic/package-spec to add the specification for the kibana/rules/ folder.

{
  "name": "detection_rules",
  "title": "Detection rules",
  "version": "0.0.1-dev.1",
  "release": "experimental",
  "description": "Rules for the detection engine in the Security application.",
  "type": "rules",
  "download": "/epr/detection_rules/detection_rules-0.0.1-dev.1.zip",
  "path": "/package/detection_rules/0.0.1-dev.1",
  "format_version": "1.0.0",
  "readme": "/package/detection_rules/0.0.1-dev.1/docs/README.md",
  "license": "basic",
  "categories": [
    "security"
  ],
  "conditions": {
    "kibana.version": "^7.12.0"
  },
  "assets": [
    "/package/detection_rules/0.0.1-dev.1/manifest.yml",
    "/package/detection_rules/0.0.1-dev.1/docs/README.md",
    "/package/detection_rules/0.0.1-dev.1/kibana/rules/CHANGELOG.json",
    "/package/detection_rules/0.0.1-dev.1/kibana/rules/rule-a9cb3641-ff4b-4cdc-a063-b4b8d02a67c7.json",
    "/package/detection_rules/0.0.1-dev.1/kibana/rules/rule-ce64d965-6cb0-466d-b74f-8d2c76f47f05.json"
  ],
  "owner": {
    "github": "elastic/protections"
  }
}

[elasticmachine]

💚 Build Succeeded

the below badges are clickable and redirect to their specific view in the CI or DOCS

Expand to view the summary

Build stats

• Build Cause: Branch indexing

• Start Time: 2021-03-16T22:28:29.973+0000

• Duration: 30 min 7 sec

• Commit: 1ac3c1e

Test stats 🧪

Test	Results
Failed	0
Passed	65
Skipped	0
Total	65

Trends 🧪

[ruflin]

@rw-access Great to see progress on this. As soon as this stabilises and you get to the package-spec work, check out our change proposal flow: https://github.com/elastic/package-spec/blob/master/CONTRIBUTING.md#change-proposals

[rw-access]

elastic/package-spec is up to date. a lot has changed and this is an integration package now, so I'm going to update the test package and publish this first to elastic/integrations.