Add node modules and package files

node_modules/@actions/core/README.md

@@ -1,7 +1,97 @@
-# `@actions/core`
-
-> Core functions for setting results, logging, registering secrets and exporting variables across actions
-
-## Usage
-
-See [src/core.ts](src/core.ts).
+# `@actions/core`
+
+> Core functions for setting results, logging, registering secrets and exporting variables across actions
+
+## Usage
+
+#### Inputs/Outputs
+
+You can use this library to get inputs or set outputs:
+
+```js
+const core = require('@actions/core');
+
+const myInput = core.getInput('inputName', { required: true });
+
+// Do stuff
+
+core.setOutput('outputKey', 'outputVal');
+```
+
+#### Exporting variables
+
+You can also export variables for future steps. Variables get set in the environment.
+
+```js
+const core = require('@actions/core');
+
+// Do stuff
+
+core.exportVariable('envVar', 'Val');
+```
+
+#### PATH Manipulation
+
+You can explicitly add items to the path for all remaining steps in a workflow:
+
+```js
+const core = require('@actions/core');
+
+core.addPath('pathToTool');
+```
+
+#### Exit codes
+
+You should use this library to set the failing exit code for your action:
+
+```js
+const core = require('@actions/core');
+
+try {
+  // Do stuff
+}
+catch (err) {
+  // setFailed logs the message and sets a failing exit code
+  core.setFailed(`Action failed with error ${err}`);
+}
+
+```
+
+#### Logging
+
+Finally, this library provides some utilities for logging. Note that debug logging is hidden from the logs by default. This behavior can be toggled by enabling the [Step Debug Logs](../../docs/action-debugging.md#step-debug-logs).
+
+```js
+const core = require('@actions/core');
+
+const myInput = core.getInput('input');
+try {
+  core.debug('Inside try block');
+  
+  if (!myInput) {
+    core.warning('myInput was not set');
+  }
+  
+  // Do stuff
+}
+catch (err) {
+  core.error(`Error ${err}, action may still succeed though`);
+}
+```
+
+This library can also wrap chunks of output in foldable groups.
+
+```js
+const core = require('@actions/core')
+
+// Manually wrap output
+core.startGroup('Do some function')
+doSomeFunction()
+core.endGroup()
+
+// Wrap an asynchronous function call
+const result = await core.group('Do something async', async () => {
+  const response = await doSomeHTTPRequest()
+  return response
+})
+```