docs: Add post about Gemini pricing

aider/website/_posts/2025-05-07-gemini-pricing.md

@@ -0,0 +1,39 @@
+---
+title: A note on Gemini 2.5 Pro Preview 0325 pricing
+excerpt: The low price reported for Gemini 2.5 Pro Preview 0325 appears to be correct.
+draft: false
+nav_exclude: true
+---
+{% if page.date %}
+<p class="post-date">{{ page.date | date: "%B %d, %Y" }}</p>
+{% endif %}
+
+# A note on Gemini 2.5 Pro Preview 0325 pricing
+
+# Timeline
+
+- Sat Apr 5 08:54:45 2025 +1300 
+  - Commit eda796d feat: Add metadata and settings for gemini-2.5-pro-preview-03-25
+  - Correct value `"output_cost_per_token": 0.000010` added to `aider/resources/model-metadata.json`
+
+- Sun Apr 6 00:20:01 2025 +0800
+  - First litellm commit of `gemini/gemini-2.5-pro-preview-03-25` metadata, with incorrect price `"output_cost_per_token": 0.0000010`
+  - Commit cd0a1e6
+
+- Wed Apr 9 18:48:43 2025 -0700
+  - litellm commit updates `gemini/gemini-2.5-pro-preview-03-25` metadata, but not price
+  - commit ac4f32f
+
+- 2025-04-12-04-55-50 UTC
+  - Benchmark performed 
+  - Repo hash 0282574 recorded in benchmark results, without "dirty" indicating it was run on a clean checkout of the repo at commit 0282574.
+  - Correct value `"output_cost_per_token": 0.000010` is in `aider/resources/model-metadata.json` at commmit 0282574
+  - Confirmed that aider built and run from commit 0282574 honors `output_cost_per_token` from `aider/resources/model-metadata.json` by putting in an absurdly high value and benchmarking `gemini/gemini-2.5-pro-preview-03-25`
+
+- Apr 12 08:06:39 2025 -0700 
+  - Benchmark results added to repo
+
+- Sat Apr 12 19:20:04 2025 +0400 
+  - Sat Apr 12 15:20:04 2025 UTC
+  - litellm commit fixes `gemini/gemini-2.5-pro-preview-03-25` price metadata to `"output_cost_per_token": 0.00001`
+  - commit 93037ea