Added a method to set the RNG seed on the context

LLama/LLamaContext.cs

@@ -86,6 +86,15 @@ namespace LLama
             NativeHandle = SafeLLamaContextHandle.Create(model.NativeHandle, lparams);
         }
 
+        /// <summary>
+        /// Set the seed for the RNG
+        /// </summary>
+        /// <param name="seed"></param>
+        public void SetSeed(uint seed)
+        {
+            NativeApi.llama_set_rng_seed(NativeHandle, seed);
+        }
+
         /// <summary>
         /// Tokenize a string.
         /// </summary>

LLama/Native/SafeLLamaContextHandle.cs

@@ -283,5 +283,14 @@ namespace LLama.Native
             }
         }
         #endregion
+
+        /// <summary>
+        /// Set the RNG seed
+        /// </summary>
+        /// <param name="seed"></param>
+        public void SetSeed(uint seed)
+        {
+            NativeApi.llama_set_rng_seed(this, seed);
+        }
     }
 }