docs(logFaces): added logFaces docs

docs/logFaces-HTTP.md

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+# logFaces Appender (HTTP)
+
+The logFaces appenders send JSON formatted log events to [logFaces](http://www.moonlit-software.com) receivers. This appender uses HTTP to send the events (there is another logFaces appender that uses [UDP](logFaces-UDP.md)). You will need to include [axios](https://www.npmjs.com/package/axios) in your dependencies to use this appender.
+
+## Configuration
+
+* `type` - `logFaces-HTTP`
+* `url` - `string` - logFaces receiver servlet URL
+* `application` - `string` (optional, defaults to empty string) - used to identify your application's logs
+* `timeout` - `integer` (optional, defaults to 5000ms) - the timeout for the HTTP request.
+
+This appender will also pick up Logger context values from the events, and add them as `p_` values in the logFaces event. See the example below for more details.
+
+# Example (default config)
+
+```javascript
+log4js.configure({
+  appenders: {
+    logfaces: { type: 'logFaces-HTTP', url: 'http://lfs-server/logs' }
+  },
+  categories: {
+    default: { appenders: [ 'logfaces' ], level: 'info' }
+  }
+});
+
+const logger = log4js.getLogger();
+logger.addContext('requestId', '123');
+logger.info('some interesting log message');
+logger.error('something has gone wrong');
+```
+This example will result in two log events being sent to `lfs-server`. Both events will have a `p_requestId` property with a value of `123`.

docs/logFaces-UDP.md

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+# logFaces Appender (UDP)
+
+The logFaces appenders send JSON formatted log events to [logFaces](http://www.moonlit-software.com) receivers. This appender uses UDP to send the events (there is another logFaces appender that uses [HTTP](logFaces-HTTP.md)). It uses the node.js core UDP support, so you do not need to include any other dependencies.
+
+## Configuration
+
+* `type` - `logFaces-UDP`
+* `remoteHost` - `string` (optional, defaults to '127.0.0.1')- hostname or IP address of the logFaces receiver
+* `port` - `integer` (optional, defaults to 55201) - port the logFaces receiver is listening on
+* `application` - `string` (optional, defaults to empty string) - used to identify your application's logs
+
+This appender will also pick up Logger context values from the events, and add them as `p_` values in the logFaces event. See the example below for more details.
+
+# Example (default config)
+
+```javascript
+log4js.configure({
+  appenders: {
+    logfaces: { type: 'logFaces-UDP' }
+  },
+  categories: {
+    default: { appenders: [ 'logfaces' ], level: 'info' }
+  }
+});
+
+const logger = log4js.getLogger();
+logger.addContext('requestId', '123');
+logger.info('some interesting log message');
+logger.error('something has gone wrong');
+```
+This example will result in two log events being sent via UDP to `127.0.0.1:55201`. Both events will have a `p_requestId` property with a value of `123`.