docs: Install instructions fix directory issue (#3290)

What this PR does / why we need it:
When you run 'feast init my_feature_repo', it makes a 'my_feature_repo' directory. However the 'feature_store.yaml' file is within another directory called 'feature_repo'. So the feast apply command gives an error if you are simply in the 'my_feature_store' directory.

Which issue(s) this PR fixes:
This fixes a minor issue in the README with the install instructions

Fixes #

Signed-off-by: Danny Chiao <danny@tecton.ai>

Signed-off-by: Danny Chiao <danny@tecton.ai>

README.md

@@ -44,7 +44,7 @@ pip install feast
 ### 2. Create a feature repository
 ```commandline
 feast init my_feature_repo
-cd my_feature_repo
+cd my_feature_repo/feature_repo
 ```
 
 ### 3. Register your feature definitions and set up your feature store
@@ -227,4 +227,4 @@ Thanks goes to these incredible people:
 
 <a href="https://github.com/feast-dev/feast/graphs/contributors">
   <img src="https://contrib.rocks/image?repo=feast-dev/feast" />
-</a>
+</a>