Cabal file and gitignore tweaks

Author: amarrella

.gitignore

@@ -2,4 +2,7 @@
 *.pem
 *.csr
 result
-*.lock
+*.lock
+.pre-commit-config.yaml
+dist-newstyle/
+dist/

.pre-commit-config.yaml

@@ -1,7 +1,6 @@
 name:                kubernetes-webhook-haskell
 version:             0.1.0.0
--- synopsis:
--- description:
+synopsis:            Create Kubernetes Admission Webhooks in Haskell
 homepage:            https://github.com/githubuser/kubernetes-webhook-haskell#readme
 license:             MIT
 license-file:        LICENSE
@@ -12,17 +11,102 @@ category:            Web
 build-type:          Simple
 extra-source-files:  README.md
 cabal-version:       >=1.10
+description:
+    This library lets you create [Kubernetes Admission Webhooks](https://kubernetes.io/docs/reference/access-authn-authz/extensible-admission-controllers/) in Haskell.
+
+    Using webhooks in Kubernetes requires some configuration, in the [dhall](./dhall) directory you can find some useful templates that you can reuse to deploy your webhooks. [cert-manager](https://cert-manager.io/docs/) is required to be installed in the cluster to use the templates.
+
+    Example webhook using Servant:
+    ```hs
+    module Kubernetes.Example
+        ( startApp,
+        app,
+        )
+    where
+
+    import Control.Monad.IO.Class
+    import qualified Data.Aeson as A
+    import qualified Data.ByteString as BS
+    import qualified Data.HashMap.Strict as HM
+    import Data.Text
+    import GHC.Generics
+    import qualified Kubernetes.Webhook as W
+    import Network.Wai
+    import Network.Wai.Handler.Warp
+    import Network.Wai.Handler.WarpTLS
+    import Servant
+    import System.Environment
+
+    type API =
+    "mutate" :> ReqBody '[JSON] W.AdmissionReviewRequest :> Post '[JSON] W.AdmissionReviewResponse
+
+    data Toleration
+    = Toleration
+        { effect :: Maybe TolerationEffect,
+            key :: Maybe Text,
+            operator :: Maybe TolerationOperator,
+            tolerationSeconds :: Maybe Integer,
+            value :: Maybe Text
+        }
+    deriving (Generic, A.ToJSON)
+
+    data TolerationEffect = NoSchedule | PreferNoSchedule | NoExecute deriving (Generic, A.ToJSON)
+
+    data TolerationOperator = Exists | Equal deriving (Generic, A.ToJSON)
+
+    testToleration :: Toleration
+    testToleration =
+    Toleration
+        { effect = Just NoSchedule,
+        key = Just "dedicated",
+        operator = Just Equal,
+        tolerationSeconds = Nothing,
+        value = Just "test"
+        }
+
+    startApp :: IO ()
+    startApp = do
+    let tlsOpts = tlsSettings "/certs/tls.crt" "/certs/tls.key"
+        warpOpts = setPort 8080 defaultSettings
+    runTLS tlsOpts warpOpts app
+
+    app :: Application
+    app = serve api server
+
+    api :: Proxy API
+    api = Proxy
+
+    server :: Server API
+    server = mutate
+
+    mutate :: W.AdmissionReviewRequest -> Handler W.AdmissionReviewResponse
+    mutate req = pure $ W.mutatingWebhook req (\_ -> Right W.Allowed) addToleration
+
+    addToleration :: W.Patch
+    addToleration = 
+    W.Patch
+        [ W.PatchOperation
+            { op = W.Add,
+            path = "/spec/tolerations/-",
+            from = Nothing,
+            value = Just $ A.toJSON testToleration
+            }
+        ]
+    ```
+
+
 
 library
   hs-source-dirs:      src
   exposed-modules:     Kubernetes.Webhook, Kubernetes.Webhook.Types
-  build-depends:       base >= 4.7 && < 5
-                     , aeson
-                     , base64-bytestring
-                     , binary
-                     , bytestring
-                     , text
-                     , unordered-containers
+  build-depends:       aeson                >= 1.4.6 && < 1.5,
+                       base                 >= 4.7 && < 5,
+                       base64-bytestring    >= 1.0.0 && < 1.1,
+                       binary               >= 0.8.6 && < 0.9,
+                       bytestring           >= 0.10.8 && < 0.11,
+                       text                 >= 1.2.3 && < 1.3,
+                       unordered-containers >= 0.2.10 && < 0.3
+                       
   default-language:    Haskell2010
 
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