feat: add Snyk provider docs (#99)

* Adds Snyk provider documentation

doc/providers/snyk.md

@@ -1,4 +1,32 @@
 ![](../../img/providers/snyk.png)
 
+# Snyk
 
-Coming Soon
+In order to use `bomber` with Snyk you will need to be a Snyk customer. Access requires your Snyk API Token, which you can retrieve from the web interface or by running: 
+
+```
+snyk config get api
+```
+
+Once you have your token you can run bomber like so: 
+
+```
+bomber scan --provider snyk --token xxx sbom.json
+```
+
+Note rather than passing the API token explicitly, you can also set this as an environment variable, either as `SNYK_TOKEN` or the generic `BOMBER_PROVIDER_TOKEN`.
+
+
+## Supported ecosystems
+
+At this time, the Snyk provider supports the following ecosystems:
+
+* npm
+* Maven
+* CocoaPods
+* Composer
+* RubyGems
+* Nuget
+* PyPi
+* Hex
+* Cargo