Write README

README.md

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 # knex-waitfordb
 Waiting knex database connection
+
+## Requirements
+You must install knex in your project
+
+## Usage
+Add premigrate script to package.json to wait for initialize database before starting migration
+```
+"scripts": {
+  "premigrate": "knex-waitfordb",
+  "migrate": "knex migrate:latest"
+}
+```
+You can use arguments to set repeat or delay, see Options
+```sh
+knex-waitfordb --retry 100 --delay 1
+```
+
+## Options
+| Option | Default | Description |
+| --- | --- | --- |
+| retry | 100 | How many times to try to connect |
+| delay | 1 | Timeout between attempts in seconds |
+| config | knexfile | Knex config file for require |
+