Add readme and license to the rigidlegs extra

Distribution/RestockExtras/RestockRigidLegs/license.txt

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+CONFIGURATION
+-------------
+
+Configs are distributed under the MIT license
+
+Copyright (c) 2019 the ReStock team
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Distribution/RestockExtras/RestockRigidLegs/readme.txt

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+========================
+RESTOCK RIGID LEGS 0.3.0
+========================
+
+Restock Rigid Legs adds alternate versions of the stock legs without the suspension module. These legs are functionally just animated parts the are by default tied to the landing gear action group. The legs are added as their own parts and do not replace the existing legs, making them compatible with saves just like any other mod. They also take advantage of the physics material switcher module added in 1.7.3, allowing for an adjustable level of friction to prevent your landers from sliding down slopes.
+
+============
+DEPENDENCIES
+============
+
+Required:
+- Restock (0.3.0)
+- ModuleManager (4.0.2)
+
+============
+INSTALLATION
+============
+
+To install, drag the RestockRigidLegs folder and ModuleManager DLL from the GameData folder you downloaded into your Kerbal Space Program Gamedata folder. If installed correctly, you should see:
+- Kerbal Space Program
+    - GameData
+        - Squad
+        - ReStock
+            - Assets
+            - Patches
+            - etc.
+        - ReStockRigidLegs
+            - Parts
+            - Resources
+            - etc.
+        - ModuleManager.4.0.2.dll
+
+============
+LOCALIZATION
+============
+
+This mod primarily uses vanilla-provided localization, but for additional strings, it provides localization support for the following languages:
+- English
+
+=========
+LICENSING
+=========
+
+See the license.txt file for more information.
+
+Any bundled mods are distributed under their own license:
+- ModuleManager by blowfish and sarbian is distributed under a Creative Commons Sharealike license. More details, including source code, can be found here: http://forum.kerbalspaceprogram.com/threads/31342-0-20-ModuleManager-1-3-for-all-your-stock-modding-needs?p=528607&viewfull=1#post528607