Create troubleshooting.md

Documenting a workaround discussed at https://hasurahq.slack.com/archives/C03263T1L9W/p1653561662369129 in a new Troubleshooting doc

PR-URL: hasura/graphql-engine-mono#4575
GitOrigin-RevId: eb80662b93f157d363cd0b53993fc5bb5972b546

server/CONTRIBUTING.md

@@ -84,6 +84,8 @@ Then in a new terminal launch `graphql-engine` in dev mode with:
 
     $ scripts/dev.sh graphql-engine
 
+This command also starts the GraphQL Engine console, which you can access at http://localhost:8181/console.
+
 The `dev.sh` will print some helpful information and logs from both services
 will be printed to screen.
 

server/troubleshooting.md

@@ -0,0 +1,8 @@
+### `cabal: Could not resolve dependencies:`
+
+a.k.a "how do I get Cabal to update the freeze file with the dependencies it needs, and why doesn't `cabal update` work?"
+- issue: `cabal freeze` also freezes the `index-state` at the bottom of the file so, in some cases, `cabal update` has no effect
+- fix: 
+  - delete the line starting with `index-state` at the bottom of the `cabal.project.freeze` file
+  - delete lines for any dependencies you want to update
+  - run `cabal update`/`cabal freeze`