Added particles and line renderer materials

Assets/ScriptableRenderPipeline/LightweightPipeline/Editor/LightweightAssetInspector.cs

                 "Percentages to split shadow volume");
 
             public static GUIContent defaultDiffuseMaterial = new GUIContent("Default Diffuse Material",
-                "Material to use when creating objects");
+                "Material to use when creating 3D objects");
+
+            public static GUIContent defaultParticleMaterial = new GUIContent("Default Particle Material",
+                "Material to use when creating Paticle Systems");
+
+            public static GUIContent defaultLineMaterial = new GUIContent("Default Line Material",
+                "Material to use when creating Line Renderers");
 
             public static GUIContent defaultSpriteMaterial = new GUIContent("Default Sprite Material",
                 "Material to use when creating Sprites");
         private SerializedProperty m_ShadowCascade2SplitProp;
         private SerializedProperty m_ShadowCascade4SplitProp;
         private SerializedProperty m_DefaultDiffuseMaterial;
+        private SerializedProperty m_DefaultParticleMaterial;
+        private SerializedProperty m_DefaultLineMaterial;
         private SerializedProperty m_DefaultSpriteMaterial;
         private SerializedProperty m_DefaultUIMaterial;
         private SerializedProperty m_DefaultShader;
             m_ShadowCascade2SplitProp = serializedObject.FindProperty("m_Cascade2Split");
             m_ShadowCascade4SplitProp = serializedObject.FindProperty("m_Cascade4Split");
             m_DefaultDiffuseMaterial = serializedObject.FindProperty("m_DefaultDiffuseMaterial");
+            m_DefaultParticleMaterial = serializedObject.FindProperty("m_DefaultParticleMaterial");
+            m_DefaultLineMaterial = serializedObject.FindProperty("m_DefaultLineMaterial");
             m_DefaultSpriteMaterial = serializedObject.FindProperty("m_DefaultSpriteMaterial");
             m_DefaultUIMaterial = serializedObject.FindProperty("m_DefaultUIMaterial");
             m_DefaultShader = serializedObject.FindProperty("m_DefaultShader");
 
             EditorGUI.indentLevel--;
 
+            EditorGUILayout.Space();
+            EditorGUILayout.PropertyField(m_DefaultParticleMaterial, Styles.defaultParticleMaterial);
+            EditorGUILayout.PropertyField(m_DefaultLineMaterial, Styles.defaultLineMaterial);
             EditorGUILayout.PropertyField(m_DefaultSpriteMaterial, Styles.defaultSpriteMaterial);
             EditorGUILayout.PropertyField(m_DefaultUIMaterial, Styles.defaultUIMaterial);
             EditorGUILayout.PropertyField(m_DefaultShader, Styles.defaultShader);

Assets/ScriptableRenderPipeline/LightweightPipeline/LightweightPipelineAsset.asset

   m_Cascade4Split: {x: 0.067, y: 0.2, z: 0.467}
   m_DefaultDiffuseMaterial: {fileID: 2100000, guid: 6a1143ee683302f4aa628c052723efc1,
     type: 2}
+  m_DefaultParticleMaterial: {fileID: 2100000, guid: e823cd5b5d27c0f4b8256e7c12ee3e6d,
+    type: 2}
+  m_DefaultLineMaterial: {fileID: 2100000, guid: 541b04d3bf488324f816937313973e15,
+    type: 2}
   m_DefaultSpriteMaterial: {fileID: 2100000, guid: e3ef893926d86c448a80512fe05b8a37,
     type: 2}
   m_DefaultUIMaterial: {fileID: 2100000, guid: 786cc499ea3906946b10ab7d24c8d0e7, type: 2}

Assets/ScriptableRenderPipeline/LightweightPipeline/LightweightPipelineAsset.cs

         [SerializeField] private Vector3 m_Cascade4Split = new Vector3(0.067f, 0.2f, 0.467f);
 
         [SerializeField] private Material m_DefaultDiffuseMaterial;
+        [SerializeField] private Material m_DefaultParticleMaterial;
+        [SerializeField] private Material m_DefaultLineMaterial;
         [SerializeField] private Material m_DefaultSpriteMaterial;
         [SerializeField] private Material m_DefaultUIMaterial;
         [SerializeField] private Shader m_DefaultShader;
 
         public override Material GetDefaultParticleMaterial()
         {
-            return m_DefaultDiffuseMaterial;
+            return m_DefaultParticleMaterial;
-            return m_DefaultDiffuseMaterial;
+            return m_DefaultLineMaterial;
         }
 
         public override Material GetDefaultTerrainMaterial()

Assets/ScriptableRenderPipeline/LightweightPipeline/Materials/Lightweight-DefaultSprite.mat

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   m_PrefabInternal: {fileID: 0}
-  m_Name: Lightweight-SpritesDefault
-  m_Shader: {fileID: 4800000, guid: 4fa7301da83bc7d469cf2a5059581c57, type: 3}
+  m_Name: Lightweight-DefaultSprite
+  m_Shader: {fileID: 10753, guid: 0000000000000000f000000000000000, type: 0}
   m_ShaderKeywords: ETC1_EXTERNAL_ALPHA
   m_LightmapFlags: 4
   m_EnableInstancingVariants: 0

Assets/ScriptableRenderPipeline/LightweightPipeline/Materials/Lightweight-DefaultUI.mat

   m_ObjectHideFlags: 0
   m_PrefabParentObject: {fileID: 0}
   m_PrefabInternal: {fileID: 0}
-  m_Name: Lightweight-UIDefault
+  m_Name: Lightweight-DefaultUI
   m_Shader: {fileID: 10770, guid: 0000000000000000f000000000000000, type: 0}
   m_ShaderKeywords: 
   m_LightmapFlags: 4

Assets/ScriptableRenderPipeline/LightweightPipeline/Materials/Lightweight-DefaultLine.mat

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Assets/ScriptableRenderPipeline/LightweightPipeline/Materials/Lightweight-DefaultParticle.mat

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