add initial rulesets (dart-archive/lints#4)

* initial rulesets

* + include

Author: pq

pkgs/lints/lib/core.yaml

@@ -0,0 +1,28 @@
+linter:
+  rules:
+    - avoid_empty_else
+    - avoid_relative_lib_imports
+    - avoid_shadowing_type_parameters
+    - avoid_types_as_parameter_names
+    - await_only_futures
+    - camel_case_extensions
+    - camel_case_types
+    - curly_braces_in_flow_control_structures
+    - empty_catches
+    - file_names
+    - hash_and_equals
+    - iterable_contains_unrelated_type
+    - list_remove_unrelated_type
+    - no_duplicate_case_values
+    - non_constant_identifier_names
+    - package_prefixed_library_names
+    - prefer_generic_function_type_aliases
+    - prefer_is_empty
+    - prefer_is_not_empty
+    - prefer_iterable_whereType
+    - prefer_typing_uninitialized_variables
+    - provide_deprecation_message
+    - unnecessary_overrides
+    - unrelated_type_equality_checks
+    - valid_regexps
+    - void_checks

pkgs/lints/lib/recommend.yaml

@@ -0,0 +1,52 @@
+include: package:lints/core.yaml
+
+linter:
+  rules:
+    - always_require_non_null_named_parameters
+    - annotate_overrides
+    - avoid_function_literals_in_foreach_calls
+    - avoid_init_to_null
+    - avoid_null_checks_in_equality_operators
+    - avoid_renaming_method_parameters
+    - avoid_return_types_on_setters
+    - avoid_returning_null_for_void
+    - avoid_single_cascade_in_expression_statements
+    - constant_identifier_names
+    - control_flow_in_finally
+    - empty_constructor_bodies
+    - empty_statements
+    - exhaustive_cases
+    - implementation_imports
+    - library_names
+    - library_prefixes
+    - null_closures
+    - overridden_fields
+    - package_names
+    - prefer_adjacent_string_concatenation
+    - prefer_collection_literals
+    - prefer_conditional_assignment
+    - prefer_contains
+    - prefer_equal_for_default_values
+    - prefer_final_fields
+    - prefer_for_elements_to_map_fromIterable
+    - prefer_function_declarations_over_variables
+    - prefer_if_null_operators
+    - prefer_initializing_formals
+    - prefer_inlined_adds
+    - prefer_is_not_operator
+    - prefer_null_aware_operators
+    - prefer_spread_collections
+    - prefer_void_to_null
+    - recursive_getters
+    - slash_for_doc_comments
+    - type_init_formals
+    - unnecessary_brace_in_string_interps
+    - unnecessary_const
+    - unnecessary_getters_setters
+    - unnecessary_new
+    - unnecessary_null_in_if_null_operators
+    - unnecessary_string_escapes
+    - unnecessary_string_interpolations
+    - unnecessary_this
+    - use_function_type_syntax_for_parameters
+    - use_rethrow_when_possible