ver Apr24th

updated proxy guideline with snapshot tips

PROXY_GUIDELINE.md

@@ -118,16 +118,16 @@ Open system network setting in the VM.
 
 Then, click on "Proxy".
 
-![proxy setting](assets/netsetting3.png)
+![proxy setting](assets/winnetsetting3.png)
 
 Switch on "Use a proxy server" and type in the correct proxy configurations.
 
-![proxy setting](assets/netsetting4.png)
+![proxy setting](assets/winnetsetting4.png)
 
 Finally, remember to click on "Save".
 
-Note only HTTP proxy is supported.  Subsequently, you can open a chrome page to
-check if the proxy works well.
+Note that only HTTP proxy is supported.  Subsequently, you can open a chrome
+page to check if the proxy works well.
 
 <!--
 ###### Configuration by Command Line
@@ -154,3 +154,17 @@ vmrun -T ws runProgramInGuest /path/to/vmx/file # TODO
 -->
 
 <!-- TODO: add remind of new snapshot -->
+
+#### 3. Create a New Snapshot
+
+After modifying the virtual machine, remember to create a new snapshot and
+start from this new snapshot at experiments.
+
+```sh
+# change ws to fusion if you use VMWare Fusion
+vmrun -T ws snapshot /path/to/vmx/file snapshot_name
+```
+
+```python
+env = DesktopEnv(snapshot_name="snapshot_name")
+```