Add dataset card with source links

README.md

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+---
+license: cc-by-4.0
+task_categories:
+  - tabular-classification
+language:
+  - en
+tags:
+  - cryptocurrency
+  - bitcoin
+  - blockchain
+  - data-analysis
+  - finance
+size_categories:
+  - 10K<n<100K
+---
+
+# Cryptocurrency Mortality Index
+
+15,261 cryptocurrencies tracked with current status, market data, and mortality indicators.
+
+## Source
+
+[DropThe.org](https://dropthe.org) — Data platform tracking 1.83 million entities including 16K+ cryptocurrencies.
+
+## Analysis
+
+- [The Crypto Graveyard: Dead Coins Data](https://dropthe.org/crypto/crypto-graveyard-dead-coins-data/)
+- [91% of Crypto Never Recovered](https://dropthe.org/coin/crypto-graveyard-coins-never-recovered/)
+- [We Tracked 16,000 Tokens](https://dropthe.org/coin/crypto-token-lifespan-data-16000/)
+
+## Fields
+
+| Field | Description |
+|-------|-------------|
+| name | Cryptocurrency name |
+| symbol | Ticker symbol |
+| slug | URL-safe identifier |
+| status | Current status |
+| market_cap | Market capitalization (USD) |
+| price | Current price (USD) |
+
+## Links
+
+- [DropThe.org](https://dropthe.org)
+- [Crypto Statistics](https://dropthe.org/data/statistics/crypto/)
+- [Methodology](https://dropthe.org/good/methodology/)