Improvements/gatsby 5 compatibility (#21)

* Update gatsby required deps versions to 5.2.0

* Set gatsby required deps as ^4

* Set gatsby required deps as 4 - 5

* Revert "Set gatsby required deps as 4 - 5"

This reverts commit 31b2351.

* Revert "Set gatsby required deps as ^4"

This reverts commit 1cd8ddc.

* Update pnpm-lock.yaml

* set gatsby-source-* as peerDependencies on it's versions 4 - 5

* Add eslint 4 - 5 ass peerDependencies

* Update pnpm-lock.yaml

* Set peerDependencies versions as pipes

* Add some instructions to readme.md

Gatsby 4 and 5 instructions

* Rename readme file as README.md

readme.md → README.md

@@ -1,10 +1,23 @@
 # gatsby-source-directus
 
-Source plugin for pulling data into Gatsby from a Directus API.
+Source plugin for pulling data into the [Gatsby GraphQL Data Layer](https://www.gatsbyjs.com/docs/reference/graphql-data-layer/) from a Directus API.
 
-## Install
 
+## 5️⃣ Installation for gatsby 4 and 5
+Depending on the `gatsby` version you are using you will need to include the following dependencies to your project on these respective versions: `@4`if you are using `gatsby@4` and `@5` if you are using `gatsby@5`.
+
+### gatsby@4 dependencies
+```bash
+npm install --save gatsby-source-graphql@4 gatsby-source-filesystem@4
+```
+
+### gatsby@5 dependencies
+```bash
+npm install --save gatsby-source-graphql@5 gatsby-source-filesystem@5
 ```
+
+### Install the package
+```bash
 npm install --save @directus/gatsby-source-directus
 ```
 

package.json

@@ -11,10 +11,13 @@
 	],
 	"dependencies": {
 		"@directus/sdk": "10.2.0",
-		"gatsby-source-filesystem": "4.13.0",
-		"gatsby-source-graphql": "4.13.0",
 		"ms": "2.1.3"
 	},
+	"peerDependencies": {
+		"gatsby-source-filesystem": "4||5",
+		"gatsby-source-graphql": "4||5",
+		"eslint": "7||8"
+	},
 	"repository": "directus/gatsby-source-directus",
 	"bugs": {
 		"url": "https://github.com/directus/directus/issues"