pdfplumber: Initial Project Proposal (#12567)

I am requesting permission to integrate
[pdfplumber](https://github.com/jsvine/pdfplumber) into OSSFuzz. I
believe that this project is a good candidate for OSS-Fuzz integration
as it extracts a PDF for detailed information about each text character,
rectangle, and line. It is used by over 12.500 repositories and 245
packages. Most notably, langflow (30k+ stars), DB-GPT (13k+ stars),
unstructured (8k+ stars) and PaddleNLP (12k+ stars)

Please see upstream approval for integration
[here](jsvine/pdfplumber#1198)

Co-authored-by: Vitor Guidi <vitorguidi@gmail.com>

projects/pdfplumber/project.yaml

@@ -0,0 +1,11 @@
+homepage: "https://github.com/jsvine/pdfplumber"
+language: python
+primary_contact: "jsvine@gmail.com"
+auto_ccs: 
+  - "ennamarie19@gmail.com"
+fuzzing_engines: 
+  - libfuzzer
+sanitizers: 
+  - address
+  - undefined
+main_repo: "https://github.com/jsvine/pdfplumber.git"