added esri in list.md file (#932)

* Update list.md: Adding Esri

---------

Co-authored-by: Chandler Weiner <23106097+crweiner@users.noreply.github.com>

docs/list.md

@@ -116,6 +116,21 @@ No one currently! Interested in having a prominent placement for your open sourc
 - **How to sign up**: [Sign into your GitHub account here](https://hacktoberfest.devict.org/) and submit two meaningful PRs to the projects on that page.
 - **Notes**: N/A
 
+### E
+
+#### **Esri**
+
+- **Swag**: Esri Summit registration and discounts
+    - 1st Place: Free registration to one Esri Summit of your choice from the following: Esri European Developer Summit 2024, Esri Developer & Technology Summit 2025, or Esri European Developer Summit 2025.Developer Summit 2025.
+    - 2nd Place: 75% discount on Esri Summit registration (same event options as above).
+    - 3rd Place: 50% discount on Esri Summit registration (same event options as above).
+- **Requirements**:
+    - At least one merged PR solving either "good first issue" or "help wanted" issue in any Esri-designated project
+    - You can earn points for only one “good first issue” per person.
+- **Requirements**: [See detailed contest rules here](https://www.esri.com/arcgis-blog/wp-content/uploads/2024/10/2024-Esri-Hacktoberfest-Contest-Official-Rules-2.pdf).
+- **How to sign up**: No signup required.
+- **Notes**: Read the full blog post with all the details [here](https://www.esri.com/arcgis-blog/products/developers/developers/hacktoberfest-2024-contribute-to-open-source-and-win/)
+
 ### F
 
 #### **Flyte**