Update Development.md

doc/Development.md

@@ -2,6 +2,20 @@
 
 ## clj setup
 
+### install leiningen
+```
+sudo apt install leiningen
+```
+or manually using Instructions on https://leiningen.org/#install
+
+### install vscode + extensions
+```
+sudo apt install code
+```
+or with packages from https://code.visualstudio.com/Download
+
+install extension "Calva: Clojure & ClojureScript Interactive Programming"
+
 ## cljs / js-dev setup
 
 ```
@@ -95,4 +109,4 @@ kubectl get pods
 ```
 java -jar target/uberjar/k8s-keycloak-standalone.jar myconfig.edn myauth.edn | kubeval -
 java -jar target/uberjar/k8s-keycloak-standalone.jar myconfig.edn myauth.edn | kubectl apply -f -
-```
+```