add init file

init.sh

+# To activate the pre-installed conda env and the latest lstchain env, uncomment the following two lines
+#source /fefs/aswg/software/conda/etc/profile.d/conda.sh
+#conda activate lstchain-v0.9.1
+
+# personal lstchain conda env comment if you want to use the pre-installed one
+conda activate lst-dev 
+
+export CODE_DIR=/../lst_scripts
+export PYTHONPATH=$CODE_DIR:$PYTHONPATH
+export CONFIG_FOLDER=../