python-ecosys/dotenv: Add .env file loader package.

Signed-off-by: holdrulff <holdrulff@gmail.com>

Author: Holdrulff

python-ecosys/dotenv/README.md

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+# dotenv
+
+Lightweight .env file loader for MicroPython.
+
+## Installation
+
+```python
+import mip
+mip.install("dotenv")\
+```
+
+## Usage
+
+```
+from dotenv import load_dotenv, get_env
+
+load_dotenv('.env')
+wifi_ssid = get_env('WIFI_SSID')
+```
+Full documentation: https://github.com/Holdrulff/micropython-dotenv

python-ecosys/dotenv/manifest.py

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+metadata(
+    description="Lightweight .env file loader for MicroPython",
+    version="1.0.0",
+)
+
+package("dotenv")

python-ecosys/dotenv/micro_dotenv.py

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+"""
+MicroPython-dotenv
+A lightweight .env file loader for MicroPython
+~1KB, zero dependencies, memory efficient
+
+Compatible with ESP32, ESP8266, RP2040, and other MicroPython boards.
+
+Author: Wesley Fernandes (community contributions welcome)
+License: MIT
+Repository: https://github.com/holdrulff/micropython-dotenv
+"""
+
+__version__ = '1.0.0'
+__all__ = ['get_env', 'load_dotenv']
+
+# MicroPython doesn't have os.environ, create our own
+_environ = {}
+
+
+def load_dotenv(path='.env'):
+    """
+    Load .env file into environment. Returns dict.
+
+    Args:
+        path (str): Path to .env file. Default: '.env'
+
+    Returns:
+        dict: Dictionary of loaded variables (_environ)
+
+    Example:
+        >>> from dotenv import load_dotenv, get_env
+        >>> env = load_dotenv('.env')
+        >>> wifi_ssid = get_env('WIFI_SSID')
+    """
+    global _environ
+    try:
+        with open(path, 'r') as f:
+            for line in f:
+                line = line.strip()
+                if line and not line.startswith('#') and '=' in line:
+                    k, v = line.split('=', 1)
+                    k, v = k.strip(), v.strip()
+                    # Remove quotes
+                    if len(v) >= 2 and ((v[0] == '"' == v[-1]) or (v[0] == "'" == v[-1])):
+                        v = v[1:-1]
+                    _environ[k] = v
+    except Exception as e:
+        print("Warning: Could not load .env file:", e)
+    return _environ
+
+
+def get_env(key, default=None):
+    """
+    Get environment variable with default.
+
+    Args:
+        key (str): Environment variable name
+        default: Default value if not found. Default: None
+
+    Returns:
+        Value of environment variable or default
+
+    Example:
+        >>> wifi_ssid = get_env('WIFI_SSID', 'default_network')
+    """
+    return _environ.get(key, default)