change repo structure; modify readme

tensorneat/algorithm/neat/gene/base.py

@@ -0,0 +1,23 @@
+class BaseGene:
+    "Base class for node genes or connection genes."
+    fixed_attrs = []
+    custom_attrs = []
+
+    def __init__(self):
+        pass
+
+    def new_custom_attrs(self):
+        raise NotImplementedError
+
+    def mutate(self, randkey, gene):
+        raise NotImplementedError
+
+    def distance(self, gene1, gene2):
+        raise NotImplementedError
+
+    def forward(self, attrs, inputs):
+        raise NotImplementedError
+
+    @property
+    def length(self):
+        return len(self.fixed_attrs) + len(self.custom_attrs)