Phase 10a: component metadata v1.1.0, README, CHANGELOG

- idf_component.yml updated: v1.1.0, description, url, IDF >=5.3
- README.md with integration guide, API reference, dependencies
- CHANGELOG.md tracking v1.0.0 and v1.1.0 releases
- All 21 unit tests pass, ESP-IDF build passes

1 files changed, 71 insertions, 0 deletions

diff --git a/components/tollgate_core/README.md b/components/tollgate_core/README.md
new file mode 100644
index 0000000..d83d634
--- /dev/null
+++ b/components/tollgate_core/README.md
@@ -0,0 +1,71 @@
+# tollgate_core
+
+ESP-IDF component providing paid WiFi hotspot logic with Cashu e-cash payments.
+
+## Features
+
+- **Session management** — time-based and bytes-based sessions with auto-expiry
+- **Cashu token processing** — decode Cashu e-cash tokens, calculate allotments, multi-mint support
+- **Per-client firewall** — whitelist-based NAT filtering with sandbox mode
+- **DNS server** — per-client DNS hijack/forward with DoT rejection
+- **Mining payment** — Stratum share tracking, hashprice calculation, difficulty conversion
+- **Stratum proxy** — transparent TCP proxy for mining traffic with job management
+- **Beacon price** — WiFi vendor IE construction for price/mint/geohash advertising
+- **Market scanner** — discover and compare nearby TollGate prices
+
+## Integration
+
+### 1. Implement platform callbacks
+
+```c
+#include "tollgate_platform.h"
+
+static tollgate_platform_t platform = {
+    .get_price_sats = my_get_price,
+    .get_step_ms = my_get_step_ms,
+    .get_mint_url = my_get_mint_url,
+    .get_metric = my_get_metric,
+    .get_time_ms = my_get_time_ms,
+    // ... other callbacks
+};
+```
+
+### 2. Initialize
+
+```c
+#include "tollgate_core.h"
+
+esp_ip4_addr_t ap_ip;
+IP4_ADDR(&ap_ip, 192, 168, 4, 1);
+tollgate_core_init(&platform, ap_ip);
+
+esp_ip4_addr_t dns;
+IP4_ADDR(&dns, 8, 8, 8, 8);
+tollgate_core_dns_start(dns);
+```
+
+### 3. Process payments
+
+```c
+tollgate_core_process_payment(client_ip, cashu_token_string);
+```
+
+### 4. Tick
+
+Call `tollgate_core_tick()` periodically (e.g., every second) to expire sessions.
+
+## API Reference
+
+See `include/tollgate_core.h` for the public API and `include/tollgate_platform.h` for platform callbacks.
+
+## Dependencies
+
+- ESP-IDF >= 5.3
+- mbedtls (SHA-256, HMAC)
+- cJSON
+- lwip
+- esp_wifi (for beacon/market features)
+
+## License
+
+Proprietary — see repository for details.