docs: Add main config file documentation

wiki/config.md

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+# Configuration File
+
+This file is the cornerstone of verdaccio where you can modify the default behaviour, enable plugins and extend features.
+
+A default configuration file is created the very first time you run `verdaccio`.
+
+## Default Configuration
+
+The default configuration has support for **scoped** packages and allow any user to access all packages but only **authenticated users to publish**.
+
+```
+storage: ./storage
+auth:
+  htpasswd:
+    file: ./htpasswd
+uplinks:
+  npmjs:
+    url: https://registry.npmjs.org/
+packages:
+  '@*/*':
+    access: $all
+    publish: $authenticated
+    proxy: npmjs
+  '**':
+    proxy: npmjs
+logs:
+  - {type: stdout, format: pretty, level: http}
+```
+
+## Sections
+
+The following sections explain what means each property and the different otpions
+
+### Storage
+
+Is the location of the default storage. **Verdaccio is by default based on local file system**.
+
+```
+storage: ./storage
+```
+
+### Authentification
+
+The authentification set up is done here, the default auth is based on `htpasswd` and is build-in. You can modify this behaviour via [plugins](plugins.md). For more information about this section read the [auth page](auth.md).
+
+```
+auth:
+  htpasswd:
+    file: ./htpasswd
+    max_users: 1000
+```
+
+### Web UI
+
+This properties allow you to modify the look and feel of the web UI. For more information about this section read the [web ui page](web.md).
+
+```
+web:
+  enable: true
+  title: Verdaccio
+  logo: logo.png
+```
+
+### Upkinks
+
+Uplinks is the avility of the system to proxy package from remote registries when those package are not available locally. For more information about this section read the [uplinks page](uplinks.md).
+
+
+```
+uplinks:
+  npmjs:
+    url: https://registry.npmjs.org/
+```
+
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