feat: add readme to denoland (#61)

* add symbolic link to readme

README.md

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+src/README.md

src/README.md

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+# deno-slack-runtime
+
+Helper library for running a Run on Slack Deno function. The goal of this
+project is to provide modules for:
+
+1. Parsing function execution event payloads into JSON (`src/parse-payload.ts`)
+2. Dynamically loading the target function (`src/load-function-module.ts`)
+3. Dispatching event payloads to individual functions by callback ID and running
+   them (`src/dispatch-payload.ts`)
+
+This library has two modes of operation:
+
+1. Using `mod.ts` as the entrypoint, a directory containing function code files
+   to be loaded at runtime must be provided as an argument. This directory must
+   contain one source file per function, with each filename matching the
+   function ID, i.e. if a function to be invoked has a `callback_id` of
+   `reverse`, the provided directory argument must contain a `reverse.ts` or a
+   `reverse.js`.
+2. Using `local-run.ts` as the entrypoint, the current working directory must
+   contain a `manifest.json`, `manifest.ts` or `manifest.js` file, which in turn
+   must contain function definitions that include a `source_file` property. This
+   property is used to determine which function to load and run at runtime.
+
+Regardless of which mode of operation used, each runtime definition for a
+function is specified in its own file and must be the default export.
+
+## Usage
+
+By default, your Slack app has a `/slack.json` file that defines a `get-hooks`
+hook. The Slack CLI will automatically use the version of the
+`deno-slack-runtime` that is specified by the version of the `get-hooks` script
+that you're using. To use this library via the Slack CLI out of the box, use the
+`slack run` command in your terminal. This will automatically run the `start`
+hook and wait for events to parse the payload.
+
+### Override
+
+You also have the option to
+[override this hook](https://github.com/slackapi/deno-slack-hooks#script-overrides)!
+You can change the script that runs by specifying a new script for the `start`
+command. For instance, if you wanted to point to your local instance of this
+repo, you could accomplish that by adding a `start` command to your
+`/slack.json` file and setting it to the following:
+
+```json
+{
+  "hooks": {
+    /* ... */
+    "start": "deno run -q --config=deno.jsonc --allow-read --allow-net file:///<path-to-your-local-repo>/local-run.ts"
+  }
+}
+```
+
+The script may be one of the following, depending on which mode you are
+operating this library in:
+
+1. Explicit function directory as argument:
+   `deno run -q --config=deno.jsonc --allow-read --allow-net https://deno.land/x/[email protected]/mod.ts ./<required-function-directory>`
+2. Local project with a manifest file:
+   `deno run -q --config=deno.jsonc --allow-read --allow-net https://deno.land/x/[email protected]/local-run.ts`
+
+⚠️ Don't forget to update the version specifier in the URL inside the above
+commands to match the version you want to test! You can also drop the `@` and
+the version specifier to use the latest released version. You can also use the
+`file:///` protocol to point to a version present on your local filesystem.
+
+## CLI
+
+You can also invoke this library directly from the command line:
+
+```zsh
+deno run -q --config=deno.jsonc --allow-read --allow-net https://deno.land/x/[email protected]/mod.ts [-p <port>]
+```
+
+Which will start an API Server that will exectue user provided code
+
+### GET /health
+
+Returns `200 OK` when called, the runtime will use this route to ensure the
+server is ready to handle requests
+
+### POST /functions
+
+Post Body contains the event payload that used to be read via stdout. Returns
+`200 OK` when there are no errors with finding and executing the expected user
+code. Will return a `500` otherwise.
+
+## Running Tests
+
+If you make changes to this repo, or just want to make sure things are working
+as desired, you can run:
+
+```zsh
+deno task test
+```
+
+To get a full test coverage report, run:
+
+```zsh
+deno task coverage
+```
+
+---
+
+### Getting Help
+
+We welcome contributions from everyone! Please check out our
+[Contributor's Guide](https://github.com/slackapi/deno-slack-runtime/blob/main/.github/CONTRIBUTING.md)
+for how to contribute in a helpful and collaborative way.