add ADOPTERS.md (#2865)

ADOPTERS.md

Signed-off-by: huabing zhao <zhaohuabing@gmail.com>
Co-authored-by: Xunzhuo <bitliu@tencent.com>

ADOPTERS.md

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+
+<!--
+
+Insert your entry using this template keeping the list alphabetically sorted:
+
+## <Company/Organization Name>
+ * Website: https://www.your-website.com
+ * Environments: AWS, Azure, Google Cloud, Bare Metal, etc
+ * Use Cases:
+    - ...
+ * Status:
+   - [ ] development & testing
+   - [ ] production
+ * (Option) Logo (show in the official site):
+ * (Option) Description:
+-->
+
+# Envoy Gateway Adopters
+
+This page contains a list of organizations who are users of Envoy Gateway, following the [definitions provided by the CNCF](https://github.com/cncf/toc/blob/main/FAQ.md#what-is-the-definition-of-an-adopter).
+
+If you would like to be included in this table, please submit a PR to this file or comment to [this issue](https://github.com/envoyproxy/gateway/issues/2781) and your information will be added.
+
+## AllFactors
+ * Website https://allfactors.com
+ * Environments:
+ * Use Case: 
+   - Routing all customer traffic to our various backends. Every time a new customer signs up we dynamically add a 
+route to a new hostname so Envoy Gateway is deeply integrated with our product.
+ * Status: Production
+ * Logo: https://allfactors.com/AllFactors-Logo.svg