feat: add read-only support of the meta API (#13)

* Add bases API.

* Implement get tables schema

* Rename GetBase to GetBaseSchema

* Add tests

* Update doc

get-bases.go

@@ -0,0 +1,37 @@
+package airtable
+
+import (
+	"net/url"
+)
+
+// GetBasesConfig helper type to use in.
+// step by step get bases.
+type GetBasesConfig struct {
+	client *Client
+	params url.Values
+}
+
+// GetBases prepare step to get bases.
+func (c *Client) GetBases() *GetBasesConfig {
+	return &GetBasesConfig{
+		client: c,
+		params: url.Values{},
+	}
+}
+
+// Pagination
+// The server returns one page of bases at a time.
+
+// If there are more records, the response will contain an offset.
+// To fetch the next page of records, include offset in the next request's parameters.
+
+// WithOffset Pagination will stop when you've reached the end of your bases.
+func (gbc *GetBasesConfig) WithOffset(offset string) *GetBasesConfig {
+	gbc.params.Set("offset", offset)
+	return gbc
+}
+
+// Do send the prepared get records request.
+func (gbc *GetBasesConfig) Do() (*Bases, error) {
+	return gbc.client.GetBasesWithParams(gbc.params)
+}