docs: add commands overview

Author: stackdumper

proxy/cache.go

@@ -6,7 +6,7 @@ import (
 	"strings"
 )
 
-// GetMetadata returns NPM response for a given package path
+// GetMetadata returns cached NPM response for a given package path
 func (proxy Proxy) GetMetadata(name string, originalPath string, header http.Header) ([]byte, error) {
 	options, err := proxy.GetOptions()
 	if err != nil {
@@ -67,7 +67,7 @@ func (proxy Proxy) GetMetadata(name string, originalPath string, header http.Hea
 	return []byte(pkg), nil
 }
 
-// ListMetadata returns a list of all cached packages
+// ListMetadata returns list of all cached packages
 func (proxy Proxy) ListMetadata() ([]string, error) {
 	options, err := proxy.GetOptions()
 	if err != nil {
@@ -87,7 +87,7 @@ func (proxy Proxy) ListMetadata() ([]string, error) {
 	return deprefixedMetadata, nil
 }
 
-// Purge deletes all cached packages
+// PurgeMetadata deletes all cached packages
 func (proxy Proxy) PurgeMetadata() error {
 	options, err := proxy.GetOptions()
 	if err != nil {

readme.md

@@ -1,11 +1,42 @@
 # npm-cache-proxy
 ![Docker Cloud Build Status](https://img.shields.io/docker/cloud/build/emeralt/npm-cache-proxy.svg?style=for-the-badge)
 
-## Usage
-...
 
-## Configuration
+- [npm-cache-proxy](#npm-cache-proxy)
+  - [Download](#download)
+  - [Usage](#usage)
+    - [`ncp`](#ncp)
+    - [`ncp list`](#ncp-list)
+    - [`ncp purge`](#ncp-purge)
+  - [Programmatic usage](#programmatic-usage)
+  - [License](#license)
+
+## Download
 ...
 
+## Usage
+
+### `ncp`
+Start proxy server.
+
+| Options                   | Env           | Default                 | Description                 |
+| ------------------------- | ------------- | ----------------------- | --------------------------- |
+| `-p, --port <port>`       | `HTTP_PORT`   | `8080`                  | Port to listen to           |
+| `-l, --limit <count>`     | `CACHE_LIMIT` | -                       | Cached packages count limit |
+| `-t, --ttl <timeout>`     | `CACHE_TTL`   | `3600`                  | Cache expiration timeout    |
+| `-h, --host  <address>`   | `REDIS_HOST`  | `http://localhost:6379` | Redis address               |
+| `-d, --db <database>`     | `REDIS_DB`    | `0`                     | Redis database              |
+| `-a, --access <password>` | `REDIS_PASS`  | -                       | Redis password              |
+
+
+### `ncp list`
+List cached packages.
+
+### `ncp purge`
+Purge cached pacakges.
+
 ## Programmatic usage
 ...
+
+## License
+[MIT](./license)