add config.json to boards for auto building

main/boards/lichuang-c3-dev/config.json

@@ -0,0 +1,12 @@
+{
+    "target": "esp32c3",
+    "builds": [
+        {
+            "name": "lichuang-c3-dev",
+            "sdkconfig_append": [
+                "CONFIG_ESPTOOLPY_FLASHSIZE_8MB=y",
+                "CONFIG_PARTITION_TABLE_CUSTOM_FILENAME=\"partitions_8M.csv\""
+            ]
+        }
+    ]
+}