add Llama 3 context preset

default/content/presets/context/Llama 3 Context.json

@@ -0,0 +1,12 @@
+{
+    "story_string": "<|begin_of_text|><|start_header_id|>system<|end_header_id|>\n\n{{#if system}}{{system}}\n{{/if}}{{#if wiBefore}}{{wiBefore}}\n{{/if}}{{#if description}}{{description}}\n{{/if}}{{#if personality}}{{personality}}\n{{/if}}{{#if scenario}}{{scenario}}\n{{/if}}{{#if wiAfter}}{{wiAfter}}\n{{/if}}{{#if persona}}{{persona}}\n{{/if}}{{trim}}<|eot_id|>",
+    "example_separator": "",
+    "chat_start": "",
+    "use_stop_strings": false,
+    "allow_jailbreak": false,
+    "always_force_name2": false,
+    "trim_sentences": true,
+    "include_newline": true,
+    "single_line": false,
+    "name": "Llama 3 Context"
+}