add .gitignore, env example

.gitignore

+.env
+__pycache__/

env.example

+OIDC_RP_REALM_URL="http://localhost:8080/realms/master/"
+OIDC_RP_CLIENT_ID=generator
+OIDC_RP_CLIENT_SECRET=VCn4LVAUc6RGLSup7VaAKsmrKUbWguaP
+
+SITE_URL=https://generator.pirati.cz
+
+SECRET_KEY=qwertzuiopasdfghjklyxcvbnm
+JWT_SECRET_KEY=qwertzuiopasdfghjklyxcvbnm