docs: add installation and API sectionsHEADmaster

1 files changed, 35 insertions, 0 deletions

diff --git a/README.md b/README.md
index 4356a70..7983c29 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,11 @@
 # mongo-cronjob
 Cron-based job scheduler which persists events to MongoDB
 
+## Installation
+```
+npm i mongo-cronjob
+```
+
 ## Usage example
 ```js
 const mongoose = require('mongoose');
@@ -28,3 +33,33 @@ EventModel.create({
   }
 });
 ```
+
+## API
+### Log
+Document interface:
+```ts
+interface LogDocument extends Document {
+  eventId: string;
+  message: string;
+}
+```
+
+### Event
+Document interface:
+```ts
+interface EventDocument<Context = any> extends Document {
+  type: string; // Scheduler will try to find a handler for this type
+  schedule: string; // Should be a valid crontab
+  status?: 'notStarted' | 'running' | 'complete' | 'failed';
+  error?: string; // Latest error thrown by handler
+  context: Context;
+  nextRunAt?: Date; // Updated on 'save' hook (based on schedule)
+  lastRunAt?: Date;
+}
+```
+Every field except for `event.context` is managed by `Scheduler` automatically. For logging and managing status (useful in handlers), following methods are available:
+ - `event.log(message: string): Promise<Log>` - create a `Log` instance and also redirect to console
+ - `event.fail(error: Error | string): Promise<Event>` - set status to `failed` and log the error nicely
+ - `event.getLogs(): Promise<Log[]>` - return all logs for this event
+ 
+