packages: add initial backend app and plugin API packages

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

packages/backend-app-api/.eslintrc.js

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+module.exports = require('@backstage/cli/config/eslint-factory')(__dirname);

packages/backend-app-api/README.md

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+# @backstage/backend-app-api
+
+This package provides the core API used by Backstage backend apps.
+
+## Installation
+
+Add the library to your backend app package:
+
+```bash
+# From your Backstage root directory
+yarn add --cwd packages/backend @backstage/backend-app-api
+```
+
+## Documentation
+
+- [Backstage Readme](https://github.com/backstage/backstage/blob/master/README.md)
+- [Backstage Documentation](https://github.com/backstage/backstage/blob/master/docs/README.md)

packages/backend-app-api/package.json

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+{
+  "name": "@backstage/backend-app-api",
+  "description": "Core API used by Backstage backend apps",
+  "version": "0.0.0",
+  "main": "src/index.ts",
+  "types": "src/index.ts",
+  "private": false,
+  "publishConfig": {
+    "access": "public",
+    "main": "dist/index.cjs.js",
+    "types": "dist/index.d.ts",
+    "alphaTypes": "dist/index.alpha.d.ts"
+  },
+  "backstage": {
+    "role": "node-library"
+  },
+  "homepage": "https://backstage.io",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/backstage/backstage",
+    "directory": "packages/backend-app-api"
+  },
+  "keywords": [
+    "backstage"
+  ],
+  "license": "Apache-2.0",
+  "scripts": {
+    "build": "backstage-cli package build --experimental-type-build",
+    "lint": "backstage-cli package lint",
+    "test": "backstage-cli package test",
+    "prepack": "backstage-cli package prepack",
+    "postpack": "backstage-cli package postpack",
+    "clean": "backstage-cli package clean",
+    "start": "backstage-cli package start"
+  },
+  "dependencies": {},
+  "devDependencies": {
+    "@backstage/cli": "^0.17.2-next.0"
+  },
+  "files": [
+    "dist",
+    "alpha"
+  ]
+}

packages/backend-app-api/src/index.ts

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+/*
+ * Copyright 2020 The Backstage Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Core API used by Backstage backend apps.
+ *
+ * @packageDocumentation
+ */
+
+export {};

packages/backend-plugin-api/.eslintrc.js

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+module.exports = require('@backstage/cli/config/eslint-factory')(__dirname);

packages/backend-plugin-api/README.md

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+# @backstage/backend-plugin-api
+
+This package provides the core API used by Backstage backend plugins.
+
+## Installation
+
+Add the library to your backend plugin package:
+
+```bash
+# From your Backstage root directory
+yarn add --cwd plugin/<plugin>-backend @backstage/backend-plugin-api
+```
+
+## Documentation
+
+- [Backstage Readme](https://github.com/backstage/backstage/blob/master/README.md)
+- [Backstage Documentation](https://github.com/backstage/backstage/blob/master/docs/README.md)

packages/backend-plugin-api/package.json

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+{
+  "name": "@backstage/backend-plugin-api",
+  "description": "Core API used by Backstage backend plugins",
+  "version": "0.0.0",
+  "main": "src/index.ts",
+  "types": "src/index.ts",
+  "private": false,
+  "publishConfig": {
+    "access": "public",
+    "main": "dist/index.cjs.js",
+    "types": "dist/index.d.ts",
+    "alphaTypes": "dist/index.alpha.d.ts"
+  },
+  "backstage": {
+    "role": "node-library"
+  },
+  "homepage": "https://backstage.io",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/backstage/backstage",
+    "directory": "packages/backend-plugin-api"
+  },
+  "keywords": [
+    "backstage"
+  ],
+  "license": "Apache-2.0",
+  "scripts": {
+    "build": "backstage-cli package build --experimental-type-build",
+    "lint": "backstage-cli package lint",
+    "test": "backstage-cli package test",
+    "prepack": "backstage-cli package prepack",
+    "postpack": "backstage-cli package postpack",
+    "clean": "backstage-cli package clean",
+    "start": "backstage-cli package start"
+  },
+  "dependencies": {},
+  "devDependencies": {
+    "@backstage/cli": "^0.17.2-next.0"
+  },
+  "files": [
+    "dist",
+    "alpha"
+  ]
+}

packages/backend-plugin-api/src/index.ts

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+/*
+ * Copyright 2020 The Backstage Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Core API used by Backstage backend plugins.
+ *
+ * @packageDocumentation
+ */
+
+export {};