Create README.md

Author: Thom-Teears

README.md

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+# SPALB 2024 Model Ensemble
+
+Download SPALB 2024 assessment report:
+
+- **Stock assessment of South Pacific albacore tuna in the western and central Pacific Ocean: 2024**\
+  **[WCPFC-SC20-2024/SA-WP-02](https://meetings.wcpfc.int/node/23119)**
+
+Download SPALB 2024 diagnostic model:
+
+- Clone the **[alb-2024-diagnostic](https://github.com/PacificCommunity/ofp-sam-alb-2024-diagnostic)** repository or download as **[main.zip](https://github.com/PacificCommunity/ofp-sam-alb-2024-diagnostic/archive/refs/heads/main.zip)** file
+
+Download SPALB 2024 model ensemble results:
+
+- The **[alb-2024-model-ensemble](https://github.com/PacificCommunity/ofp-sam-alb-2024-model-ensemble)** repository includes a **[alb-2024-model-ensemble-results.zip](https://github.com/PacificCommunity/ofp-sam-alb-2024-model-ensemble/releases/download/file/alb-2024-model-ensemble-results.zip)** file
+
+## Uncertainty
+
+The SPALB 2024 assessment uncertainty was estimated using a Monte Carlo model ensemble approach in which 100 models incorporated uncertainty in average natural mortality, stock-recruitment steepness and
+estimation error for individual models:
+
+## Model ensemble results
+
+The [alb-2024-model-ensemble-results.zip](https://github.com/PacificCommunity/ofp-sam-alb-2024-model-ensemble/releases/download/file/alb-2024-model-ensemble-results.zip) file contains all files necessary to run or browse the SPALB 2024 model ensemble.
+
+The ensemble models are run from a par file, as described in the corresponding `doitall.sh` script.
+
+The final par and rep files are consistently named `09.par` and `plot-09.par.rep` to facilitate harvesting results from across the 100 ensemble models.
+
+```
+## Estimating uncertainty
+
+See also Section 8, Section 10.6 and Table 9 in the SPALB 2024 stock assessment [report](https://meetings.wcpfc.int/node/23119).
+
+The script requires the FLR and FLR4MFCL packages:
+```
+install_github("flr/FLCore")
+install_github("PacificCommunity/FLR4MFCL")
+```