Add mojo-libc package (#32)

* Add new mojo-libc package

Signed-off-by: Manuel Saelices <msaelices@gmail.com>

* Add tests

* Add avatar and Mojo image

* Fix github link

Signed-off-by: Manuel Saelices <msaelices@gmail.com>

* Add the extra section to the recipe.yaml

Signed-off-by: Manuel Saelices <msaelices@gmail.com>

* Update libc revision to the one that includes the LICENSE

Signed-off-by: Manuel Saelices <msaelices@gmail.com>

* Fix recipe script

Signed-off-by: Manuel Saelices <msaelices@gmail.com>

* Fix the paths in the build recipe

Signed-off-by: Manuel Saelices <msaelices@gmail.com>

* Pin Max 24.6 version

* Add main() function to the tests

Signed-off-by: Manuel Saelices <msaelices@gmail.com>

* Fix test file

Signed-off-by: Manuel Saelices <msaelices@gmail.com>

* Remove test as it's broken

---------

Signed-off-by: Manuel Saelices <msaelices@gmail.com>
Co-authored-by: Caroline Frasca <42614552+carolinefrasca@users.noreply.github.com>

Author: msaelices

recipes/libc/README.md

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+# Mojo's libc
+
+`mojo-libc` is a library that provides access to the C standard library functions in Mojo.
+
+## Getting Started
+
+The only dependency for `libc` is Mojo.
+
+You can install Mojo following the instructions from the [Modular website](https://www.modular.com/max/mojo).
+
+Once you have created a Mojo project using the `magic` tool,
+
+1. Add `libc` as a dependency:
+   ```toml
+   [dependencies]
+   libc = ">=0.1.9"
+   ```
+2. Run `magic install` at the root of your project, where `mojoproject.toml` is located
+
+3. `libc` should now be installed as a dependency. You can import libc functions from the library, e.g:
+    ```mojo
+    from libc import socket
+    ```
+
+## Supported Functionality
+
+### Basic socket connections
+
+See the examples in [examples/sockets/](https://github.com/msaelices/mojo-libc/tree/main/examples/sockets) directory.
+
+### Basic file system operations
+
+See the examples in [examples/files/](https://github.com/msaelices/mojo-libc/tree/main/examples/files) directory.

recipes/libc/avatar.jpeg

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+context:
+  version: "0.1.9"
+
+package:
+  name: "libc"
+  version: ${{ version }}
+
+source:
+  - git: https://github.com/msaelices/mojo-libc.git
+    rev: 674d0fd35af4e716eb30df18cb1fe25cdddb08cf
+
+build:
+  number: 0
+  script:
+    - mojo package src/libc -o ${PREFIX}/lib/mojo/libc.mojopkg
+
+requirements:
+  host:
+    - max == 24.6
+  run:
+    - ${{ pin_compatible('max') }}
+
+about:
+  homepage: https://github.com/msaelices/mojo-libc
+  license: MIT
+  license_file: LICENSE
+  summary: Mojo's libc support
+  repository: https://github.com/msaelices/mojo-libc
+
+extra:
+  maintainers:
+    - msaelices
+    - crisadamo
+  project_name: mojo-libc