update readme to include installation method for Apple M2 chip on pyt…

…hon3.9 (#531)

README.md

@@ -33,7 +33,7 @@ Over the years, installing nmslib has becomes quite difficult. There are a numbe
 |               | Windows 11 | Windows Subsystem for Linux | Mac M1  | Mac M2  | Mac M3  | Intel Mac |
 |---------------|------------|----------------------------|---------|---------|---------|-----------|
 | Python 3.8    | ✅         | ✅                         | 💻      | ❓      | ❓      | ❓         |
-| Python 3.9    | ❌🐍       | ✅                         | 💻      | ❓      | ❓      | ❓         |
+| Python 3.9    | ❌🐍       | ✅                         | 💻      | ❌🔨     | ❓      | ❓         |
 | Python 3.10   | ❌🐍       | ✅                         | ❓      | ❓      | ❓      | ✅         |
 | Python 3.11   | ❌🐍       | ❌🐍                       | ❓      | ❓      | ❓      | ❌         |
 | Python 3.12   | ❌🐍       | ❌🐍🧠                     | ❓      | ❓      | ❓      | ❓         |
@@ -49,6 +49,8 @@ Over the years, installing nmslib has becomes quite difficult. There are a numbe
 
 🧠 = can be installed with `pip install nmslib-metabrainz`
 
+🔨 = can be installed with `conda install -c conda-forge nmslib`
+
 ❓ = unconfirmed
 
 Other methods mentioned in GitHub issues, but unconfirmed what versions they work for: