Created Llama2 instruct preset

Tested on Llama 2 13B chat model provided by TheBloke. Based on these prompt example: https://huggingface.co/TheBloke/Llama-2-13B-chat-GPTQ#prompt-template-llama-2-chat

public/instruct/Llama2.json

@@ -0,0 +1,10 @@
+{
+    "name": "Llama 2",
+    "system_prompt": "Write {{user}}'s next reply in this fictional roleplay with {{char}}.\n<</SYS>>\n",
+    "system_sequence": "[INST] <<SYS>>\n",
+    "stop_sequence": "",
+    "input_sequence": "[INST]",
+    "output_sequence": "[/INST]",
+    "separator_sequence": "\n",
+    "wrap": false
+}