Add OSGeo marketing one-pager (Issue #224)

marketing/one-pager.md

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+# OSGeo: Open Source Geospatial Foundation  
+### One-Page Marketing Overview
+
+
+## What is OSGeo?
+The Open Source Geospatial Foundation (OSGeo) is a global, non-profit organization dedicated to supporting and promoting open-source geospatial software, standards, and education. We empower individuals, governments, and organizations to build better solutions with free and open tools.
+
+
+
+## Our Mission:
+To foster global innovation by supporting collaborative development of open-source geospatial technologies and accessible geospatial education for all.
+
+
+
+## What OSGeo Provides?
+
+### **✔ Open Source Software Ecosystem**
+OSGeo hosts and supports world-class geospatial projects, including:
+
+- **QGIS** – Desktop GIS  
+- **GRASS GIS** – Advanced geospatial analysis  
+- **GDAL/OGR** – Geospatial data translation library  
+- **GeoServer & MapServer** – Web mapping servers  
+- **PostGIS** – Spatial database extension for PostgreSQL  
+- **PROJ** – Coordinate transformation library  
+- **PDAL** – Point cloud processing  
+
+These tools are free, open, and used worldwide in research, industry, and government.
+
+
+
+### **✔ Community & Collaboration**
+- Global developer community  
+- Local chapters around the world  
+- Working groups for documentation, marketing, systems, incubation, and education  
+
+
+
+### **✔ Standards & Interoperability**
+OSGeo works with OGC and other organizations to ensure open standards and interoperability between tools.
+
+
+
+### **✔ Education & Training**
+- Open geospatial course material  
+- Workshops and tutorials  
+- University outreach  
+- Mentorship programs (e.g., Google Summer of Code)
+
+
+
+### **✔ Events: FOSS4G**
+Our flagship event **FOSS4G** is the world’s largest open-source geospatial conference, attracting developers, researchers, students, and industry leaders from around the globe.
+
+
+
+## Why Choose OSGeo?
+- No license fees  
+- Full transparency  
+- Community-driven innovation  
+- Enterprise-grade tools  
+- Trusted by governments, NGOs, research labs, and companies worldwide  
+
+
+
+## Learn More:
+- Website: **https://www.osgeo.org/**  
+- Wiki: https://wiki.osgeo.org  
+- GitHub: https://github.com/OSGeo  
+- Join the community mailing lists  
+- Find local OSGeo chapters worldwide  
+
+
+
+*Empowering the world with accessible geospatial technology.*