Added PE 0.1.3 and below Level and Player format docs

Bedrock/PE_0.1.3_and_below_Level_Format.md

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+# Pocket Edition 0.1.3 and Below `level.dat` Format
+
+## Byte Order
+
+level.dat is stored in **Big Endian** byte order.
+
+## Parsing level.dat
+
+| Name | Size (in bytes) | Description |
+|------|-----------------|-------------|
+| Version | 4 | The version used to save the file. Always 1. |
+| Size | 4 | The size of the file subtracting the header(Version and Size). |
+| Spawn X | 4 | The X coordinate of the world spawn point |
+| Spawn Y | 4 | The Y coordinate of the world spawn point |
+| Spawn Z | 4 | The Z coordinate of the world spawn point |
+| Estimated World Size | 8 | The world size represented in bits |
+| Last Played | 4 | Unix timestamp indicating when the level was last saved.[\[1\]](#1) |
+| World Name Length | 2 | The length of the world name. |
+| World Name | Variable | A [CP437](https://en.wikipedia.org/wiki/Code_page_437) encoded string. |
+
+## Notes
+
+1. <a id="1"></a> Will overflow and become negative at **03:14:08 UTC on 19 January 2038** due to [the year 2038 problem](https://en.wikipedia.org/wiki/Year_2038_problem) and will overflow every ~136 years after that.

Bedrock/PE_0.1.3_and_below_Player_Format.md

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+# Pocket Edition 0.1.3 and Below `player.dat` Format
+
+## Byte Order
+
+level.dat is stored in **Little Endian** byte order.
+
+## Parsing level.dat
+
+| Name | Size (in bytes) | Description |
+|------|-----------------|-------------|
+| Version | 4 | The version used to save the file. Always 1. |
+| Size | 4 | The size of the file subtracting the header(Version and Size). Always 80. |
+| Pos X | 4 | The X coordinate of the players position. |
+| Pos Y | 4 | The Y coordinate of the players position. |
+| Pos Z | 4 | The Z coordinate of the players position. |
+| Motion X | 4 | The players motion in the X direction. |
+| Motion Y | 4 | The players motion in the Y direction. |
+| Motion Z | 4 | The players motion in the Z direction. |
+| Pitch | 4 | The players looking pitch. |
+| Yaw | 4 | The players looking yaw. |
+| Unknown | 4 | |
+| Fire | 2 | The number of ticks until the fire is put out. Negative values reflect how long the player can stand in fire before burning. Default -20. |
+| Air | 2 | How much air the player has, in ticks. Fills to a maximum of 300 in air. Decreases while underwater. |
+| Unknown | 4 | |
+| Hotbar | 36 | 9 slots that take up 4 bytes each, the first 2 bytes is the item ID, The next 2 bytes is the items data value. The last slot is always saved as `0xFF` for every byte. |