feat: add steps to install as package

PACKAGE.md

@@ -0,0 +1,34 @@
+## Install as a package
+
+* Start Solr (version 8.4 or later) nodes with -Denable.packages=true
+```bash
+$ bin/solr -c -Denable.packages=true
+```
+
+* Add repository:
+```bash
+$ bin/solr package add-repo child-transformer "https://raw.githubusercontent.com/munendrasn/child-subquery/master/repo/"
+```
+
+* List available packages:
+```bash
+ $ bin/solr package list-available
+```
+
+* Install the package
+```bash
+$ bin/solr package install child-transformer
+```
+
+* Deploy package on the collection
+
+```bash
+$ bin/solr package deploy child-transformer -y -collections test -p TRANSFORMER_NAME=childquery
+```
+> `TRANSFORMER_NAME` when not specified, defaults to `childquery`
+
+Refer [this](README.md#childsubquerytransformer) for sample usage
+
+## Development [Upcoming]
+
+> Refer to [Ishan](https://github.com/chatman)'s [repo](https://github.com/chatman/question-answering#development)

README.md

@@ -134,4 +134,4 @@ Once plugin is installed, add this to `solrconfig.xml`
   <transformer name="childquery" class="org.munendrasn.transformer.ChildSubQueryAugmenterFactory" />
 ```
 
-Or Add it using [Config API](https://lucene.apache.org/solr/guide/8_6/config-api.html#advanced-commands-for-components)
+Or Add it using [Config API](https://lucene.apache.org/solr/guide/8_6/config-api.html#advanced-commands-for-components) Or install as a [package](PACKAGE.md)